MACLOSKIE : LEGUMINOS/E. 503 



(Includes sec. Phaca, often regarded as a distinct genus, having mostly 

 yellow flowers, in lax racemes or solitary, and i -celled legumes.) 



KEY TO THE SPECIES. 

 A. Racemes capituliform. 



b. Leaflets acute, elliptical-lanceolate, plane. Low, silky, white. chubutcnsis. 



b2. Leaflets obtuse, sometimes notched. 

 c. Leaflets plicate. 



d. Leaflets 6-jugous, elliptical-ovate. Flowers yellow. ameghinoi. 



d2. Leaflets 7-io-jugous, obcordate. Flowers violet and yellow. domeykoanus. 



d^. Leaflets small. Flowers ochroleucous. Pod narrow. sancta-crucis. 



C2. Leaflets mostly plicate, oblong, 7-8-jugous. Pod inflated. palenee. 



CT,. Leaflets oblong-cuneate, 7~9-jugous. Flowers violet and yellow. Pod compressed. 



cruckshanksii. 

 A2. Racemes short, few-flowered. 



b. Leaflets linear, plicate, falcate, 5-6-jugous. Flowers blue with yellow. Pod flat, silky. 



fatagonicus. 



b2. Leaflets plane, cuneate, cloven, 5-jugous. Pod linear, refract. tehuelches. 



b$. Leaflets oblong, retuse, 6-io-jugous, hoary. Flowers purple, small. arnottianus. 



64. Leaflets oblong-elliptical, 6-jugous, plicate. Pod oval-inflated. brevtcattlis. 



5. Leaflets oblong-obovate, 5-ii-jugous, glabrous. Flowers white. Pod stiped, oblong. 



pehnenches. 

 A$. Racemes 6-io-flowered. Leaflets 7-10 jugous, linear-oblong, silky beneath. Flowers 



white, violet tips. (= distinens) bergii. 



A^. Racemes i o-i 5-flowered. Leaflets lo-jugous, linear. Ashy. Stipules free, rengifoi. 

 A$. Raceme spiciform, many-flowered. Leaflets 9-13, narrow-linear, obtuse. Flowers yellow- 

 white, distinens. 

 A6. Raceme apical on long peduncle. Leaflets io-14-jugous, elliptical, obtuse. Flowers 



ruddy-yellow. procumbcns. 



Aj. Ovary hoary. Young leaves lax-villous. moyanoi. 



i. ASTRAGALUS AMEGHINOI Speg. 



Euastragalus. Low, synochreate perennial, all appressed-ptibescent, 

 hoary or villous-silvery. Branches slender, procumbent. Leaves small, 

 unequally pinnate, almost from the middle. Leaflets about 6 pairs, ellip- 

 tic-obovate, complicate, obtuse. Racemes capituliform, the pedicel shorter 

 than the subtending leaf. Flowers subsessile, small. Calyx almost all 

 appressed-black-pubescent, 5-fid, the lobes narrow, acute, equalling the 

 tube. Corolla glabrous, yellow (?), lightly surpassing the calyx ; the vex- 

 illum and wings surpassing the keel. 



Legumes almost sessile, subglobose, mediocre, rigid-coriaceous, densely 

 hoary-villous, scarcely umbonate-apiculate, many seeded. Height 5-25 

 cm. ; root subligneous, as long as the stem. 



