Part 4, 1924] FABACEAE: GALEGEAE 209 



Gloltidium vesicarium sericeum Cocks, Legum. Louisiana 11. 1910. 

 Sesbania vesicaria atrorubra S.C. Brooks, Proc. Am. Acad. 49: 503. 1913. 



An annual herb; stem 1-2 m. high, glabrous or sparingly pubescent when young; leaves 

 1—1.5 dm. long; leaflets 20-40, oblong, rounded and mucronate at the apex, obtuse or acute 

 at the base, short-petioled, 1-3 cm. long, 3-6 mm. wide, glabrous, or slightly silky when young 

 beneath, rarely more pubescent (var. sericeum); racemes slender, 8-12 cm. long, simple or 

 sometimes branched, 5-15-flowered; bracts and bractlets subulate, caducous; calyx about 3 mm. 

 high and broad, lobes broadly triangular, acute; corolla yellowish sometimes with the lower 

 petals tinged with pink, or the whole corolla dark-red (var. atrorubrum); petals subequal in 

 length; body of the pod 5-6 cm. long, 1.5-2 cm. wide; stipe about 1 cm. long; seeds fully 1 cm. 

 long, nearly half as high. 



Type locality: Florida. 



Distribution: South Carolina to Florida and Texas. 



Illustrations: Jacq. 1c. Rar. pi. 148; Jour, de Bot. Desv. II. 1 :pl.4, 5, 1; Cocks, Legum. 

 Louisiana pi.; Am. Jour. Bot. 10: pi. 35 L. 



Subtribe 6. DIPHYSANAE. Trees or shrubs, with odd-pinnate leaves, 

 caducous stipules, and no stipels. Flowers in axillary racemes, articulated 

 to the pedicels and subtended by two caducous bractlets. Calyx surmounting 

 an evident hypanthium, 5-lobed, but the lobes unequal, the upper two broadest 

 and united higher up. Pod stipitate, oblong, the pericarp separating into 

 two layers; endocarp chartaceous, forming a flattened cell somewhat inter- 

 rupted between the seeds; exocarp papery, reticulate, becoming strongly 

 inflated, forming a bladder along each side of the legume. 



13. DIPHYSA Jacq. Enum. PI. Carib. 7, 28. 1760. 



Trees or shrubs. Leaves alternate, odd-pinnate, but the leaflets often arranged more or 

 less alternately on the rachis, short-petioluled; stipules small and caducous; stipels none. 

 Flowers solitary at the nodes of the peduncle; bracts caducous; bractlets 2 under the flower, 

 caducous. Calyx-tube campanulate, surmounting an evident turbinate or obconic hypan- 

 thium below the insertion of the staminal sheath; lobes 5, unequal, the uppermost two broad 

 and rounded at the apex, the lateral two of about the same length but narrower, obtuse or 

 acute, the lowest one narrow, lanceolate or subulate, acute or acuminate, somewhat longer 

 than the rest. Petals unequal, the banner usually the longest and the keel-petals the shortest, 

 all short-clawed; blade of the banner reflexed, suborbicular, with two callosities above the base; 

 those of the wings obliquely obovate, falcate, auriculate at the base on the upper side; those of 

 the keel-petals lunate, strongly falcate, acutish to rostrate, free at the tip, auriculate or angled 

 at the base. Stamens diadelphous, the upper filament distinct; anthers subuniform. Ovary 

 stipitate, many-ovuled. Seeds transversely oblong, somewhat oblique, attached near one 

 end to the slender funicle; radicle incurved. 



Type species, Diphysa carthagenensis Jacq. 



Branches, peduncles, and pedicels glabrous or slightly pubescent, rarely 

 hispid or prickly but not conspicuously glandular-viscid; hypan- 

 thium short; calyx-lobes and bractlets not glandular-dentate. 

 Leaflets medium-sized or large, 8-35 mm. long. I. Robinioides. 



Leaflets small, 2-6 mm. long. II. Minutifoliae. 



Branches, peduncles, and pedicels conspicuously glandular-viscid; hypan- 

 thium at least half as long as the corolla-tube; calyx-lobes and bractlets 

 glandular-denticulate. III. Glanduliferae. 



I. Robinioides 



Peduncles, rachises of the leaves, and often the young branches more or less 

 hispid (the hairs with pustulate bases) or weakly prickly as well as 

 hirsute-strigose. 



