480 FABACEAE - 



2. A. nana Nutt. Undershrub, 1-4 dm. high, glabrate or minutely strigose; 

 leaflets 15-31, elHptic or oval, rounded at both ends, mucronate, 5-10 mm. long; 

 racemes solitary, 3-6 cm. long; calyx about 3 mm. long, glabrous; lobes lance- 

 olate, acuminate, subequal; banner broadly obovate, purple; pod about 5 mm. 

 long. A, microphylla Pursh. Hills and prairies: Man.— Ida.— Colo.— Wyo. 

 Plain — Submonl, My-Je. 



3. A. canescens Pursh. Undershrub, 3-10 dm. high, white-canescent; 

 leaflets 15-47, crowded, oval or ovate-lanceolate, 9-18 mm. long, rounded at 

 the base, acute or obtuse at the apex; racemes clustered, dense, 5-18 cm. long; 

 caljrx about 5 mm. long; lobes lance-subulate; banner obovate, 5 mm. long, blue; 

 pod about 4 mm. long. Dry prairies and plains; Man,— Mich,— La.— N.M.— 

 Mont, Plain. Je-Au. 



13, PSORALEA L. Pomme de Prairie,' Pomme Blanche, 



Bread-root, Indian Turnip. 



Perennial herbs (all ours) or shrubs, with glandular-punctate foliage. Leaves 

 alternate, 3-5-foholate, with entire or toothed leaflets. Flowers perfect, in 

 peduncled spikes^ or racemes. Calyx campanulate, lobes equal, or the lower 

 ^^^f^' , ^^^^^^ ^ *^^^s white or purpHsh; banner usuallv broad and auricled 

 at the base; wmgs clawed, scythe-shaped; keel shorter than the other petals, 

 mcurved. Stamens diadelnhnns nr Trirm«rioiT^i.^.iia- «r.fi.«,. oUi^o Pr^rlc hmad. 



indehiscent 



Pods broad, 

 ovules 



1. P. juncea 



Flowers small less than 8 mm. long. in racemes or Interrupted spikes; 



pod indehiscent. (Psoraudium.) 

 Stem-leaves reduced to scales. 

 Stem leaves aU 3-5-foUolate 



Flowers in racemes, i, e., distinctly pediceUed. 



i-ods globose; corolla white, only the keel tipped with purple. 



Kacem^ short and dense, elliptic oi oblong; calyx-lobes obtuse. 



i^eaflets linear to lance-oblong; fruit glabrous or sparingly strigose. 

 J^eaflets lance-oblong to linear. 2. P. lanceolata. 



Leaflets narrowly linear. 3. p. micrantha. 



A-eaflets spatulate or obovate; fruit long- vHlous. 4. P. Purshii. 



Kacemes lax. elongate, calyx-lobes acute 



Leaves oblanceolate ; pod densely vlUous 6 P. stenostachys. 



-P^^c ^ -^^'^^ narrowly linear; pod strigose. 6. F. stenophylla. 



T .^flol'''/'^''^"i^ ^^^^ ^J. purplish; raceme elongate, lax. 

 Leaflets from hnear-oblanceolate to obovate; pods with short beaks. 

 T « X , 7. P. tenuiflora. 



Flowers^ iSe^^Cte^^^^^ ^' ^' izn.ari/o/ia. 



Leaves not sUvery below; flowers about 6 mm. long; bracts minute. 

 T^ -1 . • 9. F. coUina. 



Leaves Silvery-white at least below; flowers 7-8 mm. long; bracts at least half 



^ long as the calyx. 



Leaflets oval; bracts lanceolate, acuminate: calyx not inflated in fruit. 

 T « 10 F argophyllO" 



Flowers lar^f^ nv..n*V'o^^''i^^^^*'?^^°^^^ H- P. digitata. 



i-lowers large oj^r 1 cm. long m dense, head-Uke spikes; plant with a deep-seated. 



(pSmST) '^ long-beaked, circumscissile or bursting hregularly. 



^'"te^tf ^^fda"^^^^ ^-^ ^ ^-- ^i^^^ ^^-g-- throughout^ SJ^S"' 



PlTn'^ts'^thS^^^^^^ dm. high; lower calyx-teeth not cuspidate-acuminate. 

 ^oHjy^!ei^^e scattered hairs, not cinereous: leaflets linftir to obovate. 



peduncles hirsute 



preading 



TnnrhlnT™rT>;.r:;.rvr ^* "^^^^ 5>preauing puoescence lower caiyA-iui-^^ — - 



S'bl mH'r^h ^.V^*^^^ .l""^ pedicels, with apnressed pubescence; lower calyx- 

 PWr.+ i?^ ^^^ broader than the rest. 14 F. hypooaea. 



Plant ™|^>p^it^^^^^ appressed pubescence; leaflets broadly ofiovate or 



^^Itio'i^^^t^h^l^^^ "^""^^ ^^^^^^ than the rest. 



i-etioles with appressed pubescence; corolla nearly 2 cm. long. ^^^ 



Petioles with spreading or reflexed hairs; corolla about 12 m"m!^ong. 



Lowest calyx-lobe obovate or spatulate. obtuse, much larger "than^t^he rest. 



17. F. caslorea. 



smri;iwrt^'''* k' f*^?"" ^^^ ^"^- l^gh. with virgate branches, glabrous 

 sparingly strigose; basal leaves, if present, digitately 3-5-foliolate ; leaflets 



