Nov., 1923] RYDBERG — NORTH AMERICAN FABACEAE 495 



falcate, and united above the middle. The stamens are diadelphous, the 

 sheath is straight; the ovary is sessile, the style nearly straight to near the 

 apex, hairy along the upper side above; stigma minute. The pod is flat, 

 straight, 2-valved, transversely septate within. 



The subtribe consists of a single genus and a single species. 



7. Barbieria DC. Mem. Leg. 241. 1825 



The generic characters are included in the subtribal description. 



Illustration: Plate XXXIV G. Barbieria pinnata (Pers.) Baill., 

 X 2/3; 1. calyx, 2. stamens, 3. pistil, 4. banner, 5. wing, 6. keel-petal, 7. pod, 

 X 1 ; 8. cross section of the same; 9. seed, X 2. 



The genus was based on Clitoria polyphylla Poir. or Galactia pinnata 

 Pers. Its distribution extends from Porto Rico to Cuba, southern Mexico, 

 Bolivia, and Brazil. 



Subtribe 5. Sesbanianae 



Trees, shrubs, or herbs with abruptly pinnate leaves and caducous 

 stipules but no stipels. The flowers are borne in axillary racemes. The 

 calyx is round-campanulate, fully as broad as high, with very short teeth. 

 The banner has a broad reflexed blade and a short claw; the keel-petals are 

 strongly arcuate, united at the middle, but the claws and tips are free. 

 The stamens are diadelphous; the staminal sheath is dilated below and the 

 upper filament knee-bent near the base. The pod is 2-valved but often 

 indehiscent, stipitate and beaked, compressed, usually with cross-partitions 

 between the seeds, but not disarticulate. 



On account of the abruptly pinnate leaves this subtribe, as well as the 

 Corynellanae, is somewhat abnormal in the tribe but could not be trans- 

 Jerred to the tribe Vicieae, to which it does not show any relationship in 

 other ways. The structure of the flower is practically the same as in many 

 genera of the subtribe Robinianae; the pod, however, is, in most of the 

 genera, but slightly compressed and internally divided by false transverse 

 partitions. 



The subtribe consists of the five following genera, which are thus dis- 

 tinguished. 



Pods flattened, neither 4- winged nor 4-angled. 



Pods many-seeded, linear, with thick margins; calyx not con- 

 spicuously oblique. 

 Pod not torulose. 



Flowers middle-sized or small; banner suborbicular; 

 blades of the broad keel-petals with an auricle; seeds 

 subcylindric-oblong. 8. Sesban. 



Flowers large; banner elliptic; blades of the rather 

 narrow keel-petals without a basal auricle; seeds reni- 

 form-oblong. 9. Agati. 



Pod torulose; banner suborbicular, equaling the other 

 petals; blades of the broad keel-petals without a basal 

 auricle; seeds reniform-oblong. 10. Daubentoniopsis. 



