15 
2. H. Purshiana Benth. More or fess silky-villous or sometimes glabrous: leaflets 
1 to 3, from ovate to lanceolate, 6 to 18 mm. long: peduncles 1-flowered, usually ex- 
ceeding the leaves and mostly bracteate with a single leaflet: flowers 4 to 6 mm. long: 
calyx-teeth linear, much longer than the tube, about equaling the corolla which 
scarcely exceeds the calyx: pod about 2.5 em. long, narrow, linear, glabrous.—A very 
comuion western species, reported from Gillespie County, and doubtless abundant 
enough in northern and western Texas. 
9. PSORALEA L. 
Perennial herbs, usually sprinkled all over or roughened (especially 
the calyx, pods, ete.) with glandular dots or points, mostly palmately 3 
to 5-foliolate leaves, blue-purplish or white flowers in spikes or racemes, 
diadelphous or monadelphous stamens with half. the anthers often 
smaller or less perfect, and a small thick often wrinkled indehiscent 1- 
seeded pod, 
* Leaves pinnately 3-foliolate. 
1. P. rhombifolia Torr. and Gray. Sparingly pubescent: leaflets rhombic-ovate, 
12 to 18 mm. long, shorter than the petiole, dotted with scarcely visible glands: pe- 
duncles longer than the leaves, at length recurved, having a few-flowered capitate 
spike: bracts ovate, acuminate: calyx hirsute, with lanceolate teeth: corolla pur- 
’ plish, small.—In eastern Texas, and extending as far west as Gillespie County and 
up the Rio Grande to Eagle Pass. 
** Leaves palmately 3 to 5-foliolate: roots not tuberous: lowers in loose racemes. 
2. P. tenuiflora Pursh. Slender, erect, much branched and bushy, 6 to 12 dm. high, 
minutely hoary-pubescent when young: leaflets 3 to 5, varying from linear to 
obovate-oblong, 12 to 36 mm. long, glandular-dotted: flowers 4 to 6 mm. long: lobes 
of the calyx and bracts ovate, acute : pod glandular. (P. floribunda Nutt.)—Through- 
out western Texas, and abundant on the ‘ Staked Plains.” 
3. P. linearifolia Torr. & Gray. Tall and slender, divaricately branched, slightly 
pubescent with appressed hairs: leaflets 3, narrowly linear, elongated, mucronate, 
the upper surface dotted with black glands, lower surface scarcely dotted, 5 to 7.5 
em. long and 2 to 4 mm. wide; stipules minute, subulate, deciduous: racemes few- - 
flowered, much longer than the leaves: calyx-lobes and bracts lanceolate,—A species 
of Arkansas and eastern Texas, possibly not within our range, but represented by 
var, ROBUSTA Coulter, in which the whole plant is more robust: leaves linear-oblong 
(4 to Gem. long and 5 to 6 mm. wide) and thickly black-dotted above and below: flow- 
ers mostly in clusters of 3, distant along the rhachis.—Collected in Donley County, 
northwestern Texas, by Nealley, 
*** Leaves palmately 2 to 5-foliolate: roots tuberous : Jlowers in dense spike-like racemes. 
4. P. esculenta Pursh. Roughish hairy all over: stem stout, 12 to 40 em. high, 
erect from a tuberons or turnip-shaped farinaceous root: leaflets obovate or lance- 
olate-oblong: spikes oblong, long-peduncled : calyx-lobes and bracts lanceolate, 
nearly equaling the corolla which is 12 mm. long.—Extending from the northern 
prairie States to the Brazos and the high plains of western Texas and the upper Rio 
Grande. The ‘‘pomme blanche” or ‘ pomme de prairie” of the voyageurs. 
5. P. hypogeea Nutt. Tuber small: nearly acaulescent, hoary with appressed 
hairs: leaflets linear: spikes short-capitate, on peduncles 1 to 5 em. long: calyx 
narrow, 6 to 12 mm. long.—Stony bluffs of southern and western Texas. 
6. P. cuspidata Pursh. Stout and tall, from a deep-seated tuber, hoary with ap- 
pressed hairs: leaflets usually broadly oblanceolate, obtuse: flowers large, the petals 
12 to 16 mm. long, exceeding the lanceolate-lobed calyx.—South to the San Antonio 
and west to the Pecos, 
