Part 7, 1929] 



FABACEAE: GALKGEAK 



405 



51. CYSTIUM Steven, Bull. Soc. Nat. Mose. 29 2 : 147. 1856. 



Glaux Medic. Vorl. Churph. Phys. Ges. 2: 374. 1787. Not Glaux L. 1753. 



Leafy-stemmed annual or perennial herbs. Leaves odd-pinnate, with broad leaflets and 

 nearly free stipules. Flowers usually in long-peduncled axillary racemes. Calyx- tube 

 campanulate, the teeth subulate. Corollas white or purplish, middle-sized. Banner obovate, 

 subsessile, often retuse, slightly arcuate. Wings clawed, the blade oblanceolate, with a large 

 basal auricle. Keel-petals clawed, the blade broadly lunate, with a small auricle. Stamens 

 diadelphous (9 and 1), the sheath nearly straight, broad at the base, the free portion of the 

 stamens curved upward. Ovary sessile or nearly so, many-ovuled, straight, the style curved 

 upwards above the middle, glabrous, the stigma minute. Pod sessile or subsessile, papery 

 or parchment-like, much inflated, from orbicular to ovoid, the tip usually upcurved, perfectly 

 2-celled, the septum from the lower suture reaching the upper. Seeds obliquely round-reniform. 



Type species, Astragalus Cicer L. 



Stem and usually the leaves more or less canescent. 



Cespitose perennials with a branched caudex, the stems less than 1 dm. high; 



racemes short, few flowered; banner only slightly longer than the wings. 

 Annuals, or if perennials the stem erect, more than 3 dm. high and mostly 

 simple below [in C. Jtigricalyce distinctly cespitose]; racemes elongate; 

 banner decidedly longer than the wings. 

 Stem and leaves glabrous or sparingly strigose; cespitose perennials; racemes 

 short and dense. 

 Corolla white. 

 Corolla purplish. 



1. Platytropia 



1. Platytropia. 



COULTKRIANA. 



Lentiginosa. 



DlPHYSA. 



Pod strigose; banner only slightly longer than the wings. 

 Pod glabrous; banner decidedly longer than the wings. 



2. COULTERIANA 



Pod glabrous. 



Corolla purple; calyx-teeth not more than half as long as the tube. 



Calyx-teeth about one fourth as long as the tube; corolla about 1 cm. 

 long; pubescence of long straight appressed hairs; pod 2 cm. long 

 or less, short-acuminate. 

 Calyx-teeth nearly half as long as the tube; corolla about 1.5 cm. 

 long; pubescence of short curved hairs; pod 2-3 cm. long, long-acu- 

 minate. 

 Corolla white. 



Calyx-teeth half as long as the tube. 

 Calyx-teeth nearly as long as the tube. 

 Pod more or less strigose. 



Calyx densely black-hairy. 



Corolla ochroleucous ; calyx villous. 

 Corolla purple; calyx strigose. 

 Calyx white-hairy, rarely with a few black hairs. 



Pod densely white-silky, rather firm; whole plant usually white- 

 silky; corolla blue-purple, rarely white. 

 Pod broadly ovoid; corolla 15 mm. long. 



Pod lanceolate in outline, strongly falcate; corolla 10-12 mm. 

 long. 

 Pod with short, mostly curved hairs, membranous; corolla about 

 12 mm. long. 

 Leaflets pubescent on both sides. 



Pubescence of straight appressed hairs; corolla purplish. 



Calyx-teeth about half as long as the tube; stem mostly 



simple. 

 Calyx-teeth about one fourth as long as the tube; stem 

 branched below. 

 Pubescence of more or less spreading curled short hairs; 

 corolla white. 

 Leaflets glabrous above; corolla white. 



3. Lentiginosa 

 Pod glabrous. 



Pod leathery, arcuate, 2.5-3 cm. long; corolla 1-1.5 cm. long. 



Leaflets glabrous on both sides; calyx-teeth more than half as long 

 as the tube; pod not mottled. 

 Calyx-tube 7-8 mm. long, 3—1 mm. wide, corolla about 1.5 cm. 



long; pod obliquely ovoid, slightly arcuate. 

 Calyx-tube 4—5 mm. long, 3 mm. wide or less; corolla 10-12 mm. 

 long. 



1. C. platylrope. 

 19. C. griseolum. 



2. C. Fremontii 



3. C. Kenncdyi. 



4. C. yuccanum. 



5. C. macroiobiun. 



6. C. nigricalyce. 

 29. C. tehatchapiense. 



7. C. Coulteri. 



8. C. agninum. 



9. C. ArthU'Schottii. 

 10. C. eremicuni. 



11. C. vulpinum. 



12. C. strattiineii) 



13. C. Merrillii, 



