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FOC | Family List | FOC Vol. 10 | Fabaceae

31a. Astragalus "Caprini group"

短缩茎群 duan suo jing qun

Plants acaulescent to caulescent. Leaflets always in pairs, in upper part glabrous or hairy but never cottonlike. Calyx tubular or campanulate. Petals glabrous or rarely hairy; wings and especially keel mostly distinctly shorter than standard, wing limbs rounded at apex, auricles of wings mostly short, rarely up to 3 mm; limbs of keel straight or ± triangular, never with minute teeth at upper edge. Legumes of very different sizes.

About 195 species: from Europe and N Africa to Siberia, China, and India; 14 species (three endemic) in China.

1 Standard and wings hairy   (2)
+ All petals glabrous   (4)
2 (1) Leaflets on both surfaces densely covered with appressed hairs; calyx 13-21 mm; standard 23-28 mm.   219 A. nicolaii
+ Leaflets glabrous adaxially; calyx 9-15 mm; standard 14-19 mm   (3)
3 (2) Stipules green; leaves 7-10 cm, sessile or with very short petiole; legumes with a stipe 1-3 mm.   220 A. orbiculatus
+ Stipules whitish membranous; leaves 15-30 cm; petiole 4-7 cm; legumes sessile.   217 A. lasiopetalus
4 (1) Plants completely glabrous   (5)
+ Plants at least in part hairy   (7)
5 (4) Plants acaulescent; leaflets in 7 or 8 pairs, suborbicular; peduncle 15-18 cm; racemes as long as peduncle, remotely up to 20-flowered.   216 A. fukangensis
+ Plants caulescent, rarely acaulescent; leaflets in 10-15 pairs, ovate; peduncle much shorter; racemes 5-9-flowered   (6)
6 (5) Plants glabrous or sometimes in part to loosely hairy, acaulescent or with a stem sometimes up to 7 cm; stipules 10-20 mm, narrowly ovate, not distinctly nerved; peduncle 0.5-2 cm.   223 A. psilosepalus
+ Plants always completely glabrous, with a stem up to 20 cm; stipules 20-30 mm, narrowly triangular, very long acuminate, distinctly longitudinally nerved; peduncle 8-9 cm.   218 A. luculentus
7 (4) Stipules distinctly longitudinally nerved; inflorescence often with some black hairs; petiole and rachis often at least partly hardening toward end of vegetation period and persistent   (8)
+ Stipules without distinct longitudinal nerves; plants never with black hairs   (10)
8 (7) Plants densely or sparsely covered with hairs 1-2(-2.5) mm; leaflets mostly hairy on both surfaces.   224 A. rhizanthus
+ Plants sparsely covered with hairs 0.3-0.7(-1) mm; leaflets glabrous adaxially   (9)
9 (8) Standard 19-23 mm; auricles of wing limbs ca. 1 mm; ovary and legumes subsessile, hairy.   221 A. pindreensis
+ Standard 24-27 mm; auricles of wing limbs 2-2.5 mm; ovary and legumes with a stipe 2-4 mm, glabrous.   226 A. webbianus
10 (7) Leaflets adaxially glabrous or hairy; keel limbs slightly obliquely elliptic, stretched straight forward.   225 A. schanginianus
+ Leaflets adaxially glabrous   (11)
11 (10) Keel limbs large, at least as long as wing limbs, only connate in proximal 1/3   (12)
+ Keel limbs always shorter than wing limbs, connate nearly to top   (13)
12 (11) Keel always longer than wings, limbs much larger (longer and wider) than wing limbs; petiole and rachis slender.   215 A. flexus
+ Keel ca. as long as wings, limbs as long as wing limbs; petiole and rachis stout, at base 2-3 mm thick; leaflets with whitish cartilaginous margins, with long hairs sitting on small tubercles.   213 A. austrodshungaricus
13 (11) Stipules 10-20 mm, free from petiole; leaves 12-35 cm; leaflets 8-30 × 5-22 mm, glabrous or abaxially sparsely hairy; calyx glabrous or with a few hairs at teeth only.   223 A. psilosepalus
+ Stipules distinctly shorter, if upper ones up to 15 mm, then adnate to petiole for 3-5 mm; leaves up to 16 cm; leaflets up to 10(-14) × ca. 6 mm, abaxially sparsely to rather densely hairy; calyx at least in upper part distinctly hairy   (14)
14 (13) Stipules adnate to petiole for 3-5 mm; leaflets densely crowded to touching; calyx 13-15(-17) mm, teeth 5-6 mm; legumes sessile, with a beak 3-5 mm, covered with hairs up to 3 mm.   214 A. charguschanus
+ Stipules adnate to petiole up to 1 mm; leaflets not densely crowded; calyx 11-12 mm, teeth 2.5-4 mm; legumes with a stipe ca. 3 mm, with a beak ca. 2 mm, covered with hairs 1-2 mm.   222 A. przhevalskianus

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