Part 5, 1929] 



KABACEAE: GALEGEAE 



251 



Subtribe 10. ASTRAGALANAE. Herbs, or rarely shrubs or trees. 

 Leaves usually odd-pinnate, reduced to a single leaflet in some species of 

 Honialobus and Jonesiella; abruptly pinnate in Caragana, and digitate-tri- 

 foliate in Orophaca. Flowers in axillary racemes, with small, persistent bracts, 

 usually racemose, but with short pedicels. Calyx with a campanulate or 

 cylindric tube and 5 lobes. Corolla usually consisting of an obovate banner, 

 longer than the other petals and with flaring margins, rather broad wings with 

 a large basal auricle directed downward, and shorter keel-petals with more or 

 less lunate blades. Stamens usually diadelphous, with equal anthers. Ovary 

 usually many-seeded, style glabrous and incurved above, and stigmas minute, 

 terminal. Pods very variable, from papery to woody in texture, stipitate or 

 sessile, perfectly 1 -celled, or perfectly or partially 2-celled by a false septum 

 formed by the intrusion and coalescence of the valves at either suture, usually 

 many-seeded. 



Herbs, with odd-pinnate or ternate leaves. 

 Keel not produced into a distinct beak. 



Fruit * wholly 1 -celled, the lower suture rarely sulcate but never in- 

 flexed and forming a partition. 

 Pod * more or less compressed laterally, both sutures prominent. 

 Leaflets spine-tipped; fruit 1— i-seeded. 

 Leaflets not spine-tipped; fruit several- to many-seeded. 

 Fruit without a gynophore. 

 Fruit with a gynophore, exceeding the calyx. 

 Pod not laterally compressed, or if slightly so, the lower suture 

 not prominent. 

 Legume * usually leathery or woody in texture. 

 Leaves pinnate. 



Valves of the pod not winged. 



Legume stipitate, the body with two grooves on 

 the upper side, one on each side of the suture. 

 Legume sessile, without two grooves on the 

 upper side. 

 Calyx campanulate; stems usually elongate. 

 Pod erect, not cross-ribbed ; corolla middle- 

 sized, the banner narrow, moderately 

 arched . 

 Legume rounded at the base, ovoid or 

 ellipsoid, terete in cross-section or 

 nearly so. 

 Legume mostly acute at each end, more 

 or less lunate, ovate or cordate in 

 cross-section. 

 Pod spreading, cross-ribbed ; corolla small, 

 the banner broad, strongly arched. 

 Calyx cylindric; flowers large; plants mostly 

 low with decumbent stems; pod horizontal. 

 Valves of the pod winged. 

 Leaves digitately 3-foliolate; pod ovoid, few-seeded, in- 

 dehiscent; plant mostly pulvinate. 

 Legume membranaceous or papery. 



Pod linear- or oblong-cylindric, straight, not inflated, the 

 valves rather close-fitting to the seeds. 

 Legume sulcate on both sutures, more or less 



20 -shaped in cross-section. 

 Legume not sulcate on either suture. 



Pod distinctly stipitate, without fibers within; 

 calyx-tube cylindric; calyx-teeth very short; 

 corolla rather large, the banner narrow and 

 slightly arched. 

 Pod subsessile, the cavity more or less tra- 

 versed by fibers; calyx-tube campanulate; 

 calyx-teeth longer; corolla small, the banner 

 broad and strongly arched. 



32. Kkntrophyta. 



33. Homalobus. 



34. Gynophorarta. 



35. Diuoi.cos. 



36. Cnbmidophacos. 

 43. Batidophaca. 



37. MlCROPHACOS. 



38. Xyi,ophacos. 



39. Pterophacos. 



40. Orophaca. 



41. Holcophacos. 



i2. LONCHOPHACA. 



44. PlSOPHACA. 



* No distinction in meaning is here intended between " fruit," "pod," and "legume," but differ- 

 ent words are used merely to help the eye in using the key. In giving the measurements of the pod, 

 "wide " or " broad " is used to denote the distance from suture to suture, and " thick " the ex- 

 treme distance across the pod from valve to valve. 



17 



