PEA FAMILY 455 



Wings and keel more or less adnate to the fllament-tube; ovules 2-6; leaves odd- 

 pixuiate. 

 Stamens 9 or 10. 14. Parosela. 



Stamens 5. 15. Petalostemon. 



Tribe VII. GALEGEAE. 



Leaflets with stipels; pods margined on one edge; trees or shrubs. 16. Robinia. 

 Leaflets without stipels; pods not margined; herbs or uiidershrubs. 



S Jpules modified into spines. 17. Peteria. 



Stipules not modified into spines. 



Keel (lower petal) not produced into a beak. 

 Leaves odd-oinnate, or unifoliolate or simple. 

 Pods papery, strongly inflated. 



Pods strictly 1-celled. 18. Phaca. 



Pods 2-celled. 



Pods terete or nearly so. 19. Cystium. 



Pods sharoly S-angled in cross-section. 20. 0\i:v. 



Pods coriaceous or chartaceous, if thin-walled, not inflated. 

 Pods 2-celled with a perfect or nearly perfect partition. 

 Pods fleshy, indehiscent or very tardily dehiscent. 



21. Geoprumnon. 

 Pods membranous, leathery or woody, deliiscent. 



Pods ovoid or oblong, rarely almost didynious, terete or vertically 



flattened, leathery or woody. 22. ASTRAGALUS. 



Pods linear, somewhat laterally flattened, membranous. 



23. H AMOS A. 



Pods 1-celled, the partition, if any, rudimentary. 



Lower suture strongly intruded, making the pod sagittate or ob- 

 cordato in cross-section; pod membranous, rarely leathery. 



24. TiUM. 



Lower suture not intruded or merely sUghtly so; pods in the latter 

 case woody. 

 Pods woody or chartaceous, never flattened laterally; both 

 sutures not prominent. 

 Pods more or less stipitato. 



Pods with two grooves on the upper side, strictly 1-celled. 



2.5. DiHOLCOS. 



Pods without grooves on the upper side, usually with a 

 partial partiton. 

 Leaves unifoUolate. 26. JONESIELIA. 



Leaves odd-pinnate. 27. Rydbergiella. 



Pods sessile, usually without even a rudimentary partition. 

 Valves of the pods not winged. 



Pods with a fleshy epicarp, in fruit cross-ribbed; leaf- 

 lets obscurely articulated to the rachis, fleshy, nar- 

 row. 28. Ctenophyllum. 

 Pods without fleshy epicarp ; leaflets distinctly articu- 

 lated to the rachis. 

 Calyx cylindrical; flowers large; plant mostly low 



and cespitose. 30. Xylophacos. 



Calyx campanulate; flowers small. 



Corolla yellow; calyx-lobes linear-lanceolate, 

 equalling the tube; stipules united; stem 

 low. 29. Cnemidophacos. 



Corolla purple; calyx-lobes oriangvdar, much 

 shorter than the tube; stipules free or nearly 

 so; stem tall and slender. 



31. MiCROPHACOS. 



Valves of the pods winged. 32. Pterophacos. 



Pods membranous, usually somewhat flattened laterally, if terete, 



both sutures prominent. 

 Partial partition present. 33. Atelephragma. 



Partial partition wanting. 



Leaflets not spimflose-tipped; pods several-seeded. 



34. Ho^L\LOBUS. 

 Leaflets spinulose-tipped ; pods 1-2-seeded. 



35. Kentrophyta. 

 Leaves digitately 3-foUolate. 



Flowers racemose. 36. Oreophaca. 



Flowers capitate (some species of). 4. Trifolium. 



Keel (lower petals) produced into a beak. 37. Aragallus. 



Tribe VIIJ GLYCYRRHIZEAE. 

 One genus. 38. Glycyrrhiza. 



Tribe IX. HEDYSARIEAE. 



Leaves odd-pinnate, with several pairs of leaflets, without stipels. 



Pods 4— several-seeded, neither spiny nor dorsally toothed. 39. Hedysarum. 



Pods 1-2-seeded, more or less spiny or toothed. 40. Onobrychis. 



Leaves 3-foUolate, with stipels. 41. Meibomia. 



