Part 2, 1920] FABACEAE: PSORALEAE 123 



Leaflets spatulate-linear, pubescent, but not glandular -dotted; bracts 



shorter than the calyces and the buds. 33. P. pubescens. 



Calyx silky with an appressed pubescence. 



Bracts lanceolate to broadly obovate, not much if at all exceeding the 

 calyces or the flower-buds. 

 Spikes globose; leaflets mostly 3. 34. P. tenuis. 



Spikes oblong to cylindric; leaflets usually more than 3. 

 Spikes cylindric. in fruit 7-10 mm. thick. 



Leaflets 5—11, linear or linear-oblanceolate; bracts pubescent 



throughout. 35. P. Reverchoni. 



Leaflets mostly 5, narrowly linear or linear-filiform; bracts with 



glabrous tips. 36. P. Stanfieldii. 



Spikes oblong, in fruit 12-15 mm. thick. 37. P*pulcherrimus. 



Bracts narrowly lanceolate, much exceeding the calyces and the buds. 38. P. decumbens. 



XI. Ornati 



Spikes oblong, 1.5 cm. thick or more in fruit; leaflets obovate or broadly 



elliptic. 

 Bracts lanceolate, long-attenuate, much exceeding the buds or calyces. 

 Bracts broadly obovate, abruptly acuminate, scarcely exceeding the buds 



or calyces. 

 Spikes cylindric, 1 cm. thick or less in fruit; leaflets oblong; bracts about 



equaling the calyces. 

 Bracts broadly obovate. short-acuminate; banner broadly oblong, truncate 



or subcordate at the base. 

 Bracts lanceolate to rhombic-lanceolate; banner cordate. 



1. Petalostemon gracilis Nutt. Jour. Acad. Phila. 7: 92. 1834. 



Petalostemon bicolor Bertol. Mem. Accad. Bologna 2: 273. 1850. 

 Kuhnistera gracilis Kuntze, Rev. Gen. 192. 1891. 



A perennial, with a creeping rootstock; stems decumbent, 3-6 dm. long, slender, terete, 

 glabrous; leaves few, shorter than the nodes, 2-4 cm. long, spreading; stipules subulate; leaflets 

 5-7, linear-oblong, or the lower oblong-oblanceolate, 8-20 mm. long, acute, glabrous, not 

 conspicuously punctate; spikes solitary at the ends of the long branches, oblong, or at first 

 subglobose, 1-2 cm. long, in fruit 8 mm. thick; bracts elliptic, with subulate tips, scarcely 

 exceeding the calyces; calyx glabrous, 3 mm. long; tube obtusely 5-ribbed, 10-nerved; lobes 

 triangular-lanceolate, acute, ciliolate, 1 mm. long; corolla white; blade of the banner elliptic- 

 obovate, retuse, abruptly contracted at the base, 2.5 mm. long, equaling the claws; blades of 

 the other petals elliptic, 2.5 mm. long, the claws 1.5 mm. long; pod obliquely-obovoid. 



Type locality: Lower part of Alabama. 



Distribution: Mississippi, Alabama, and Florida. 



Illustrations: Mem. Accad. Bologna 2: pi. 13, f. 1; Bertol. Misc. Bot. 9: pi. .J,/. /. 



2. Petalostemon albidus (T. & G.) Small, Fl. SE. U. S. 

 630. 1903. 



Petalostemon carneus Ell. Bot. S. C. & Ga. 2: 176. 1824. Not P. carneus Michx. 1803. 

 Petalostemon carneus albidus T. & G. Fl. N. Am. 1:311. 1838. 



A perennial, somewhat woody and branched at the base; stems erect or ascending, 5-10 

 dm. high, slender, glabrous, terete, more or less branched, leaves numerous, 2-5 cm. long, 

 glabrous, usually with short branches of clustered smaller leaves in their axils; stipules sub- 

 ulate; leaflets 5-7, linear-oblong to linear-oblanceolate, 4—12 mm. long, acute, often involute, 

 glabrous; spikes terminating slender branches, cylindric or oblong, in fruit 8-10 mm. thick, 

 1-2.5 cm, long, bracts narrowly lanceolate, caudate-acuminate, glabrous, slightly exceeding 

 the bud and about equaling the mature calyces, persistent or tardily deciduous, glabrous; 

 bristles 1.5 mm. long; calyx glabrous, about 3 mm. long; tube obtusely angled, 10-nerved; 

 lobes triangular-lanceolate, nearly 1 mm. long; corolla white; blade of the banner 

 oval or elliptic-obovate, retuse at the apex, cuneate or abruptly contracted at the 

 base, 2-2.5 mm. long, about 1.75 mm. wide, equaling the claw; blades of the other petals 

 elliptic, 2.5-3 mm. long, 1.25 mm. wide, the claws 1.5 mm. long; pod obliquely obovoid, 2.5 

 mm. long, sparingly pilose above, the beak at right angles to the axis. 



Type locality: Near Milledgeville, Georgia. 

 Distribution: Georgia and Florida. 



