266 
- LEPTOCARPI. 28. 
Weak annuals. Flowers rarely 1 em. long, mostly 
very small, in heads (rarely in few-flowered racemes). 
Pods papery, not inflated, linear (narrowly oblong in A. 
Wrightii) and falcate ‘below (straight in A. Wrightii 
and nearly so in A. leptocarpus), sulcate dorsally, sharply 
acute (obtuse in A, Francisquitensis), sessile (stipitate 
in A. Lindheimeri), mostly horizontal (nearly erect in 
A. Wrightii), never closely reflexed, 2-celled (partition 
rarely incomplete). Stipules not connate. 3 
KEY. 
A. Flowers few and racemose at least in fruit, with blunt or barely 
acute keel not at all produced, purple-tipped; peduncles filiform. 
Pods smooth. Plants of the Tropical life zone (A. Nuttallianus 
extends also into the Lower Temperate life zone), nearly smooth 
throughout when mature. 
AB.  Pods about 1 cm. long, nearly smooth. 
Very slender plants. ~- 234 Francisquitensis. 
A2B. Pods at least 2.5 cm. long, arched most below when curved, 
mostly more than 2 mm. high, narrowed at both ends, and ap- 
parently stipitate in A.  Lindheimeri. Flowers 1-1.5 cm. 
long. Banner deeply notched, white spot large and purple- 
veined, wings white. Peduncles axillary and long. Leaflets 
7-8 pairs, broadiy elliptical to obovate, notched, thin. Bracts 
subulate, Stems not conspicuously sulcate, growing in dense 
vegetation and seemingly erect but weak and sprawling when 
not supported. Plants of the southeastern part cf the great 
plains, nearly smooth when mature. 
Pods 5mm. high. 235 Lindheimeri. 
Pods 2 mm. high. 236 leptocarpus. 
‘2A. Flowers in heads, purple or purple-tipped. Keel not acuminate 
nor sharp. Pods equally arched or nearly straight, 1.5-4 cm. 
long, linear cr nearly so. Peduncles filiform, not over 5 cm. 
=- long, axillary. Plants slender but mostly erect. 
2AB. Plants of the Californian plains. Pods not shaggy, on 
reflexed pedicels but with tips often erect, stipitate or ta- ` 
pering at base, nearly smooth at maturity, taper-pointed, not 
fully 2-celled, dorsally sulcate, nearly circular to reniform 
. in cross-section, inclined to be obcompressed. Flowers 7-12... 23 * 
. mm. long. Calyx tube about 2 mm. long, campanulate, ni- —— 
 grescent, reflexed to horizontal in fruit, with teeth triangular ^ 
to subulate and rather shorter than the tube. Bracts and 
pedicels short. Heads of flowers not elongating in fruit. Pet- 
 ioles all evident except on the uppermost leaves. Stems M 
to 2 feet high, rather widely branched below. — 1 
1c Fods r-a em lebe 5. o e 
| Plants of exan | 
