76 
7. P.cyphocalyx Gray. Simple or sparingly paniculate at summit, 6 to 9 dm. 
high, strigulose-subcinereous, the caudex dilated below the summit into a large 
globular tuber: leaflets 3 to 5, linear, the larger 7.5 cm. long, the lower petioles 
nearly as long; stipules subulate: racemes rather long-peduncled, with many- 
flowered approximate fascicles: bracts ovate, acuminate: calyx-tube very one- 
sided, the upper side being strongly gibbous-saccate, the lobes lanceolate and acumi- 
nate.—Rocky prairies between the Colorado (above Austin) and the Rio Grande 
(below the Pecos). 
8. P. Reverchoni Watson. ‘Tall and branching, 6 dm. high, canescent with short 
appressed pubescence: leaflets 2 to 5, linear-oblong, acute at each end, 12 to 24 mm. 
long; stipules usually equaling the petiole, 2 to 6 mm. long: flowers few, in short 
close racemes: bracts very broadly ovate and concave, abruptly acuminate: calyx 
8mm. long, nearly equaling the petals; the long-acuminate lobes exceeding the 
tube.—Rocky prairies in Hood and Johnson Counties. 
10. BYSENHARDTIA HBK. 
Shrubs or small trees, glandular-punctate, with odd-pinnate leaves, 
numerous small stipellate leaflets, small white flowers in terminal more 
or less densely spicate racemes, corolla hardly at all papilionaceous, 10 
diadelphous stamens, and a more or less falcate pod. 
1. B. amorphoides HBK. Shrub 12 to 21 dm. high, more or less pubescent: leaf-— 
lets 5 to 14 (usually 10) pairs, oblong, very obtuse or retuse, about 5mm. long: style 
with a large oval gland at apex: pod 6 to 8 mm. long, erect and curved.—Through- 
out southern and western Texas south of the Colorado. 
2, EB. orthocarpa Watson. A tree 30 to 45 dm. high, distinguished from the last 
by the more numerous leaflets (10 to 23 pairs), which are also larger, 10 to 16 mm. 
long, and by the larger pods, 10 to 16 mm. long, which are straight and pendent.— 
Extending from Mexico and New Mexico into the mountains west of the Pecos. 
11. AMORPHA L. (FALSE INDIGO.) 
Shrubs with odd-pinnate leaves, dotted and usually stipellate leaf- 
lets, violet or purple flowers crowded in clustered terminal spikes, co- 
rolla of a single petal (the standard) which is wrapped around the 
stamens and style, 10 stamens monadelphous at base, and oblong 
roughened 1 or 2-seeded pod exceeding the calyx. 
1. A. fruticosa L. Pubescent or nearly glabrous: leaflets 8 to 12 pairs, oblong to 
broadly elliptical, scattered: calyx somewhat pubescent, the lower tooth acuminate 
and longest, the others commonly obtuse: standard purple, deeply emarginate: pod 
9-seeded.—River banks, apparently throughout Texas. A tall shrub, sometimes ar- 
borescent, and very variable. 
2, A. levigata Nutt. Glabrous and very smooth: leaves large, the leaflets large, 
distant, elliptical-oblong, very obtuse, attenuated below: flowers in long (20 to 25 em.) 
clustered spikes: calyx very glandular, nearly glabrous except the margin, the 3 
lower teeth longer and acuminate, the others acute: standard deep blue: pod 
1-seeded.—Extending from Arkansas into Texas as far as the San Antonio. 
3. A. paniculata Torr. & Gray. Whole plant canescently tomentose except the 
upper leaf-surface, which is nearly glabrous and shining: leaves 20 to 30 cm. long or 
more; the leaflets 7 or 8 pairs, elliptical-oblong, 3.5 to 7.5 cm. long, very obtuse, often 
retuse at each end: spikes numerous, virgate, in a large nearly naked exserted 
branching panicle: calyx tomentose and glandular, the 3 lower teeth longer and 
triangular-subulate: standard purple, broadly cuneiform.—On the Rio Grande in 
extreme western Texas. 
