257
Oxy opis jams anii (Fabaceae, Papilionoideae, As agaleae), a
new species o sec ion Xe obia om Mongolia
Shukhe do j Baasanmunkh1, Da iganga Munkh ulga1, Ba lai Oyun se seg2, Keum Seon Jeong3,
Hyeok Jae Choi1
1 Depa men o Biology and Mic obiology, Changwon Na ional Uni e si y, Changwon 51140, Republic o Ko ea
2 Depa men o Biology, School o A s and Sciences, Na ional Uni e si y o Mongolia, Ulaanbaa a 14201, Mongolia
3 Sejong Na ional A bo e um, Sejong 30106, Sou h Ko ea
Co esponding au ho : Hyeok Jae Choi ([email p o ec ed])
Copy igh : © Shukhe do j Baasanmunkh e al.
This is an open access a icle dis ibu ed unde
e ms o he C ea i e Commons A ibu ion
License (A ibu ion 4.0 In e na ional – CC BY 4.0).
Resea ch A icle
Abs ac
The genus Oxy opis L. (Fabaceae) comp ises o e 600 accep ed species, anking
amongs he la ges in he amily. Nea ly 100 Oxy opis axa ha e been epo ed om
Mongolia, spanning i e subgene a and 20 sec ions in Mongolia. In his s udy, a new
species, Oxy opis jams anii Munkh . & Baasanm., om he Ikh Bogd Moun ains in Mon-
golia, is desc ibed and illus a ed. Based on mo phological cha ac e is ics, i belongs o
he sec ion Xe obia. Al hough simila o O. lep ophylla and O. sobole skajae wi hin he
sec ion, O. jams anii is clea ly dis inguished by i s indumen um, aceme s uc u e, lea le
numbe and shape and co olla colou . The i s occu ence o O. sobole skajae — p e i-
ously known only om he Republic o Tu a o Russia — in he lo a o Mongolia is also
epo ed he e. Taxonomic nomencla u e, mo phological desc ip ions, dis ibu ion maps
and ield pho og aphs o he new species and i s wo close ela i es a e p o ided.
Key wo ds: Flo a o Mongolia, new species, Oxy opis, axonomy, Xe obia
In oduc ion
The genus Oxy opis L. (locoweed), comp ising mo e han 600 accep ed spe-
cies (Malyshe 2008; POWO 2025), is one o he la ges and mos di e se
gene a in Fabaceae (Malyshe 2008). I s na i e ange spans he suba c ic and
empe a e egions o he No he n Hemisphe e (POWO 2025). In Mongolia,
nea ly 100 Oxy opis axa ha e been epo ed, ep esen ing i e subgene a and
20 sec ions (Ulziykhu ag 2003; Malyshe 2008; Baasanmunkh e al. 2022). Re-
cen ly, a new species O. oyunmaae Munkh . & Baasanm., was desc ibed om
he Khus gul Region o Mongolia (Baasanmunkh e al. 2025a).
The sec ion Xe obia Bunge, comp ising mon ane xe ophy es, includes 27
species dis ibu ed ac oss Cen al Asia and Asian Russia (Malyshe 2008).
Amongs hese, 15 species ha e been epo ed om Mongolia, including ou
endemics and eigh subendemics (Baasanmunkh e al. 2021, 2022). This sec-
ion is cha ac e ised by impa ipinna e lea es wi h 2–8 pai s o lea le s and
acemes bea ing 1–8 lowe s. The lowe s a e la ge (20–30 mm long), wi h
sessile o s ipi a e (s ipe o 5 mm) legumes ha a e o oid o cylind ical, 5–27
Academic edi o : S ephen Boa w igh
Recei ed:
22 Sep embe 2025
Accep ed:
22 Oc obe 2025
Published:
4 No embe 2025
Ci a ion: Baasanmunkh S, Munkh ulga
D, Oyun se seg B, Jeong KS, Choi HJ
(2025) Oxy opis jams anii (Fabaceae,
Papilionoideae, As agaleae), a
new species o sec ion Xe obia
om Mongolia. Phy oKeys 265:
257–266. h ps://doi.o g/10.3897/
phy okeys.265.172785
Phy oKeys 265: 257–266 (2025)
DOI: 10.3897/phy okeys.265.172785
258
Phy oKeys 265: 257–266 (2025), DOI: 10.3897/phy okeys.265.172785
Shukhe do j Baasanmunkh e al.: A new Oxy opis species om Mongolia
mm and memb anous o hickly lea he y (Polozhii 1994; Malyshe 2008; Zhu
e al. 2010). Recen s udies ha e examined gene ic di e si y and phylogene ic
ela ionships (Kholina e al. 2021) as well as na u al selec ion on lea shape
(Wang e al. 2021) in se e al species o sec ion Xe obia om China, Sibe ia and
Mongolia. Wi hin he sec ion, only one species, Oxy opis sobole skajae Pjak,
has been desc ibed om he Republic o Tu a, Russia (Pyak 2014).
In he p esen s udy, a new species, O. jams anii, om sec ion Xe obia in
Mongolia, is desc ibed, based on ex ensi e mo phological e idence. Addi ion-
ally, O. sobole skajae is newly eco ded o he Mongolian lo a.
Ma e ials and me hods
Field su eys o collec ing Oxy opis specimens and de ailed ield pho o-
g aphs ha e been conduc ed ac oss Mongolia since 2020, yielding o e
200 he ba ium specimens deposi ed in he UBU (He ba ium o he Na ional
Uni e si y o Mongolia). A a ge ed expedi ion was unde aken in he Ikh
Bogd Moun ains, Bayankhongo P o ince, om 2–14 July 2025; his sou h-
e n Mongolian ange eaches a maximum ele a ion o 3,600 m. Addi ion-
al he ba ium specimens we e examined om he He ba ia ALTB, LE, MW,
NS, GFW, UBA and UBU (Thie s 2023) and Flo aGREIF (h ps:// lo ag ei .
uni-g ei swald.de). Pho o obse a ions o selec ed Oxy opis species we e
c oss- e i ied h ough he “Flo a o Mongolia” p ojec on iNa u alis pla o m
(h ps://www.ina u alis .o g/p ojec s/ lo a-o -mongolia; Baasanmunkh e
al. (2025b)). A dis ibu ion map was p oduced, based on hese he ba ium
specimen eco ds using A cGIS (Es i 2012).
Resul s and discussion
In his s udy, a new species, Oxy opis jams anii Munkh . & Baasanm., is de-
sc ibed om he Ikh Bogd Moun ains, Jins Soum, Bayankhongo P o ince,
Mongolia. In addi ion, O. sobole skajae is epo ed o he i s ime om he
Mongolian lo a. Taxonomic no es o h ee species in sec ion Xe obia includ-
ing O. jams anii, O. lep ophylla (Pall.) DC. and O. sobole skajae a e gi en.
Taxonomic ea men
Oxy opis subgenus Oxy opis, sec ion Xe obia Bunge, subsec ion Ampulla
Oxy opis jams anii Munkh . & Baasanm., sp. no .
u n:lsid:ipni.o g:names:77371484-1
Fig. 1
Diagnosis. Oxy opis jams anii is mo phologically mos simila o O. lep o-
phylla and O. sobole skajae wi hin sec ion Xe obia, bu di e s in ha ing 3- o-
liola e lea es wi h lanceola e, sho -cuspida e lea le s 10–15 mm long [ s. O.
lep ophylla, 4–6 pai s, linea , ob use o acu e, 5–10 (20) mm; s. O. sobole s-
kajae, 2–3 pai s, linea o linea -oblong, sligh ly acu e, 10–35 mm long]; ca-
lyx 12–14 mm long, wi h dense, long whi e ichomes ( s. O. lep ophylla, 8–11
mm long, wi h so dis an whi e, wi h some black hai s; s. O. sobole skajae,
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Phy oKeys 265: 257–266 (2025), DOI: 10.3897/phy okeys.265.172785
Shukhe do j Baasanmunkh e al.: A new Oxy opis species om Mongolia
11–13 mm long, wi h black, app essed, sinuous hai s and mo e spa se, long,
whi e, squa ose, sligh ly cu ed hai s) (Table 1).
Type. Mongolia • Bayankhongo P o ince, Bogd Soum, 44°57'59.4"N,
100°22'23.5"E, 2,960 m a.s.l., 07 July 2025, B. Oyun se seg, S. Baasanmunkh &
D. Munkh ulga MU06 [Holo ype UBU0039447! (Fig. 2)].
Desc ip ion. Acaulous pe ennial he b, ca. 5 cm all, o ming small ma s; wi h
e y sho caudex b anches; he bage g ey-g een, subglab ous. S ipules sca ious,
app essed-pilose, cilia e along ma gins. Lea es 2–3 cm long, sligh ly sho e
Figu e 1. Oxy opis jams anii Munkh . & Baasanm., sp. no . A. Gene al habi s; B. Flowe ; C. S anda d; D. Wings; E. Keel; F. Pis il;
G. S amens; H. Pods; I. Pod al e; J. Lea es; K. Lea , adaxial iew; L. Lea , abaxial iew (pho o c edi s: D. Munkh ulga).
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Shukhe do j Baasanmunkh e al.: A new Oxy opis species om Mongolia
Figu e 2. Holo ype o Oxy opis jams anii Munkh . & Baasanm (UBU0039447).
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Shukhe do j Baasanmunkh e al.: A new Oxy opis species om Mongolia
han o equalling peduncles, pe iole and achis glab ous o spa sely app essed
whi e long ichomes. Lea le s 3, lanceola e, sho -cuspida e, 10–15 × 3–4 mm,
glab ous, a ely app essed whi e-pilose on bo h su aces. Racemes 1- o 2- low-
e ed; peduncles app essed spa sely whi e-hai ed. B ac s linea , 2–3 × ca.
1.5 mm, g eenish, lea -like, densely se iceous-pubescen . Calyx memb anous,
g ey-g een o da k pu ple, ubula , 12–14 mm long, densely co e ed wi h long
whi e ichomes; lobes acumina e, 2.5–3 mm. Co olla pu ple o bluish-pu ple;
s anda d 20–22 mm long wi h b oad-o al, undi ided lamina; wings 16–18 mm
long, sho e han s anda d, apex obliquely ema gina ed; keel 13–15 mm, wi h
a beak ca. 2 mm a apex. Legume memb anous, b oadly o a e, in la ed and
cys -like, 1-locula , 20–30 (including a 3–5 mm long beak) × 12–15 mm, wi h a
en al sep um up o 2.5 mm b oad, co e ed wi h whi e, squa ose, so hai s.
Dis ibu ion. Endemic o Mongolia (Fig. 5).
Habi a . This species occu s in g a elly alpine a eas and mon ane g asslands.
E ymology. The species is named in honou o P o . Tseden Jams an (Цэдэн
Жамсран, bo n in 1935), a dis inguished Mongolian bo anis who made signi -
ican con ibu ions o he s udy and documena ion o he lo a o Mongolia
(such as Flo a o he Gu an Saikhan Moun ains).
Oxy opis lep ophylla (Pall.) DC., As agalogia 77 (ed. qua o), no. 12 (1802)
Fig. 3
Diagnosis. Mo phologically, O. lep ophylla is mos simila o O. di e si olia E.
Pe e . bu di e s in ha ing lea es 2–10 cm long, 9–13- oliola e ( s. lea es 3–5
cm long, 3- oliola e), acemes compac o a he lax, 2–5- lowe ed ( s. acemes
1–2- lowe ed).
Type. Russia • Eas e n Sibe ia, Bu ya ia: “≡ As agalus lep ophyllus Pall. I in.
III. s. l., s.d. l., ., He b. Pallas” [Lec o ype BM000958890, designa ed by Byal
and Sy in (2022); Syn ype M0185403].
Dis ibu ion. China (no h-cen al), Mongolia (eas ) and Russia (K asnoya sk,
Chi a, Tu a) (POWO 2025).
Habi a . This species occu s in sandy s eppes and ocky s eppe slopes.
Addi ional specimens examined. Mongolia • Eas Mongolia Region: Sukh-
baa a P o ince, E dene sagaan Soum, Zo ol-Khan Moun ain, 14 June 1980, I.
A. Gubano 5669 (MW0183848, MW0183848); • Khen ii P o ince, Bayankhu ag
Soum, Zaan-Shi ee Moun ain, 47°14'43.9"N, 111°33'59.0"E, 1,200 m a.s.l., 19
Table 1. Mo phological compa isons o h ee Oxy opis species in sec ion Xe obia in Mongolia.
Cha ac e is ics O. jams anii O. lep ophylla O. sobole skajae
Plan s subglab ous almos glab ous whi e pubescence
Raceme 1–2- lowe ed 2–5- lowe ed 1–2- lowe ed
Lea es
2–3 cm long, glab ous o
di use spa sely-hai ed;
lea le s 3
1–2 cm o 7–10 cm long,
glab ous; lea le s 4–6 pai s
1.5–6.5 cm long, densely co e ed wi h
app essed, sligh ly squa ose hai s; lea le s
2–3-pai ed
Co olla pu ple-bluish-pu ple aspbe y- ed pink whi ish-pink o ligh c imson
Pods b oad-o a e, 20–30 mm
long b oad-o a e, 15–25 mm long globose-o a e, 17–25 mm long
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Shukhe do j Baasanmunkh e al.: A new Oxy opis species om Mongolia
June 1987 V. I. G ubo , E. Ganbold, A. L. Budan se , R. V. Kamelin & Sh. Da-
iimaa 17 (MW0183847); • Do nod P o ince, Khalkhgol Soum, Num ug Ri e ,
47°05'00.0"N, 119°30'00.0"E, 800 m a.s.l., 29 June 1987, V. I. G ubo , E. Gan-
bold, A. L. Budan se , R. V. Kamelin & Sh. Da iimaa 746 (MW0183845); • Do -
nod P o ince, Khalkhgol Soum, Num ug Ri e , 46°59'18.0"N, 119°23'34.2"E, 877
m a.s.l., 17 July 2017, B. Oyun se seg & S. Baasanmunkh s.n. (UBU0011943);
• Sukhbaa a P o ince, E dene sagaan Soum, Bichig Boom , 45°43'01.9"N,
116°11'15.5"E, 912 m a.s.l., 08 Augus 2023, B. Oyun se seg, D. Munkh ulga &
Figu e 3. Oxy opis lep ophylla in Mongolia. A. Gene al habi s; B. Raceme; C. Flowe ; D. B ac ; E. Calyx; F. S anda d;
G. Wings; H. Keel; I. Pis il; J. S amens; K. Pods; L. Lea es (pho o c edi s: D. Munkh ulga).
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Shukhe do j Baasanmunkh e al.: A new Oxy opis species om Mongolia
A. Und uul EP13 (UBU0035024); • Do nod P o ince, Khalkhgol Soum, Sumiin
Khooloi, 47°15'1852.04"N, 118°59'32.59"E, 910 m a.s.l., 20 May 2024, D. Munkh-
ulga s.n. (UBU0040642, UBU0041010).
Oxy opis sobole skajae Pjak, No dic J. Bo . 32(2): 139 (2013)
Fig. 4
Diagnosis. Mo phologically, O. sobole skajae is mos simila o O. lep ophylla,
om which i di e s in se e al key cha ac e is ics: lea le s 3–10-pai ed, abaxi-
ally spa sely app essed-hai y, adaxially glab ous ( s. 2–3-pai ed, abaxially a he
densely app essed-hai y, adaxially spa sely hai y o glab ous); and in lo escences
equalling he lea es, wi h lowe s in umbella e acemes o 2–5 ( s. clea ly sho -
e han lea es, lowe s soli a y o a ely 2) (Pyak 2014). Addi ionally, O. sobole s-
kajae occu s only in wes e n Mongolia, whe eas O. lep ophylla is ound in cen al
and eas e n Mongolia. O. sobole skajae is also simila o O. klemen zii N.Ulziykh.,
Figu e 4. Oxy opis sobole skajae in Mongolia. A. Gene al habi ; B. Flowe ; C. S anda d; D. Calyx; E. Wings; F. Keel; G. B ac ;
H. Pis il; I. S amens; J. Pods (pho o c edi s: D. Munkh ulga).
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Shukhe do j Baasanmunkh e al.: A new Oxy opis species om Mongolia
bu di e s in i s in la ed, hinly memb anaceous, globose-o a e pods wi h a long
beak, co e ed wi h whi e, squa ose, sligh ly sinuous, so hai s ( s. ha d, hickly
co iaceous, nu le -shaped pods co e ed wi h pubescen omen ose).
Type. Russia • Republic o Tu a: Pii-Khem Dis ic , Sese lig Ri e Valley, nea he
b idge, no h-exposed s eppe slopes wi h spa se bushes, 51°52'12"N, 94°21'16"E,
759 m a.s.l., 1 Jun 2009, A. I. Pyak s.n. (Holo ype: TK, Iso ypes: LE, NS).
Dis ibu ion. Acco ding o he dis ibu ion map p o ided by Pyak (2014), he
Tu a popula ion o his species occu s nea he bo de wi h wes e n Mongolia.
Field expedi ions we e conduc ed in wes e n Mongolia adjacen o he Tu a
bo de , whe e we newly ound O. sobole skajae in Malchin Soum, U s P o ince.
Habi a . This species occu s in pe ophy ic meadows and ocky s eppe a eas.
Addi ional specimens examined (New eco d). • U s P o ince, Malchin
Soum, 49°41'17.9"N, 93°15'39.4"E, 1,622 m a.s.l., 31 May 2024, B. Oyun se seg,
G. Baya maa & D. Munkh ulga Wes 2409 (UBU0036128).
Acknowledgemen s
The au ho s hank he wo anonymous e iewe s o hei insigh s, which helped
imp o e he manusc ip . We also hank And ei I. Pyak o his aluable discus-
sions ega ding he axonomic s a us o O. jams anii and O. sobole skajae.
Addi ional in o ma ion
Con lic o in e es
The au ho s ha e decla ed ha no compe ing in e es s exis .
E hical s a emen
No e hical s a emen was epo ed.
Figu e 5. Dis ibu ion map o h ee Oxy opis species in Mongolia. Oxy opis jams anii ( ed s a s), O. lep ophylla (black
iangle), O. sobole skajae (pink ci cle).
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Phy oKeys 265: 257–266 (2025), DOI: 10.3897/phy okeys.265.172785
Shukhe do j Baasanmunkh e al.: A new Oxy opis species om Mongolia
Use o AI
No use o AI was epo ed.
Funding
This s udy was suppo ed by esea ch g an s om he Sejong Na ional A bo e um o
Ko ea (2024-KS-OB-1-1-1-16), he Na ional Resea ch Founda ion o Ko ea (RS-2022-
NR068406) and he Ko ea Basic Science Ins i u e (Na ional Facili ies and Equipmen
Cen e ) g an unded by he Minis y o Educa ion (2023R1A6C101B022).
Au ho con ibu ions
SB designed his s udy. SB and DM w o e he o iginal d a o he manusc ip . DM, SB,
BO, KSJ and HCJ collec ed he samples. SB and HJC e ised he manusc ip . All he
au ho s ha e e ised and ag eed o he published e sion o he manusc ip .
Au ho ORCIDs
Shukhe do j Baasanmunkh h ps://o cid.o g/0000-0003-4224-9376
Da iganga Munkh ulga h ps://o cid.o g/0009-0009-0175-203X
Ba lai Oyun se seg h ps://o cid.o g/0000-0003-3772-3301
Keum Seon Jeong h ps://o cid.o g/0009-0008-8577-9493
Hyeok Jae Choi h ps://o cid.o g/0000-0001-6315-0071
Da a a ailabili y
All o he da a ha suppo he indings o his s udy a e a ailable in he main ex .
Re e ences
Baasanmunkh S, U gamal M, Oyuns se seg B, G abo kaya-Bo odina A, Oyundelge K,
Gundegmaa V, Tsegmed Z, Kechaykin AA, Kechayink AA, Pyak AI, Zhao LQ, Choi HJ
(2021) An upda ed checklis o endemic ascula plan s o Mongolia. Di e si y 13:
619. h ps://doi.o g/10.3390/d13120619
Baasanmunkh S, U gamal M, Oyun se seg B, Sukho uko AP, Tsegmed Z, Son DC, E s
A, Oyundelge K, Kechaykin AA, No is J, Kosache P, Ma J-S, Chang KS, Choi HJ
(2022) Flo a o Mongolia: Anno a ed checklis o na i e ascula plan s. Phy oKeys
192: 63–169. h ps://doi.o g/10.3897/phy okeys.192.79702
Baasanmunkh S, Munkh ulga D, Oyun se seg B, Choi HJ (2025a) Oxy opis oyunmaae
sp. no . (Fabaceae) om Khu sgul p o ince, Mongolia. No dic Jou nal o Bo any 10:
e04853. h ps://doi.o g/10.1002/njb.04853
Baasanmunkh S, Oyun se seg B, Tsegmed Z, Und uul A, Munkh ulga D, U gamal M,
Nyambaya N, Ja zandolgo C, Baya maa C, Na anga uu D, Ba baya N, Nyam-
su en K, Namuulin T, Munkhzul O, Ind a G, Ba suga G, Tsengel E, Kim YM, Cal-
laghan CT, Choi HJ (2025b) iNa u alis p ojec s ep esen a aluable esou ce o
agg ega ing plan obse a ions and engaging socie y: A case s udy o he Flo-
a o Mongolia p ojec . Plan s, People, Plane : 1–12. h ps://doi.o g/10.1002/
ppp3.70054
Byal VV, Sy in AK (2022) Lec o ypi ica ion o some names, published by PS Pal-
las, in As agalus L. and Phaca L. (Fabaceae). Sk o so ia 8(2): 25. h ps://doi.
o g/10.51776/2309-6500_2022_8_2_25
Es i (2012) Ad ancing he powe o geog aphy. Fo business, go e nmen , and socie y.
h ps://www.es i.com/enus/abou /abou ‐es i/o e iew
