159 
from all following nodes, rather shorter than leaves, horizontally refracted in fruit: 
corolla about 2 mm. long, white: pod didymous, only the summit free.—On the Colo- 
rado and southward. 
* * * Depressed or low-tufted species: corolla salverform or funnelform: filaments as 
well as anthers or style summit exserted (reciprocally) quite out of the throat: 
Sructiferous peduncles all short and recurved : pods about } free: seeds crateriform. 
4. H. humifusa Gray. Annual, much branched from the root, repeatedly dichoto- 
mous, forming a depressed tuft, puberulent and viscid: leaves linear-lancéeolate, 
thickish (12mm, or more long), mucronate, with setulose-ciliate scarious stipules: 
flowers in all the forks, crowded with the leaves at the ends of branchlets: calyx 
4-parted into long setaceous-subulate spr sading lobes: corolla pale-purple or nearly 
white, open-funnelform, 6 mm. long, hardly twice the length of the calyx.—Sandy 
or gravelly plains and hills throughout Texas, but especially on the ‘‘Staked Plains” 
and in western Texas generally. 
5. H. Croftiz Britton & Rusby. Annual, depressed-spreading, with stems about 
2.5 cm. long, simple or dichotomously branching, minutely scabrous: leaves oblanceo- 
late (5 to 10mm. long), tapering into a very short petiole, revolute, obtuse: flowers 
white, minute (about 3mm. long) sessile in the axils: fruit short-stalked, about 2mm. 
high, clothed with short hairs.—Near San Diego (Miss Croft). 
6. H. Wrightii Gray. Many-stemmed from a deep lignescent root, erect or spread- 
ing, glabrous or very obscurely pruinose: leaves thickish, linear or lowest rather 
lanceolate (1 to 2.5 cm. long), with naked stipules: flowers in terminal glomerate 
leafy cymes: corolla purplish or nearly white, between salverform and funnelform, 
4 to hardly 8 mm. long.—Hills and mountains throughout our range, especially west 
of the Pecos. 
“* = * Erect perennials, with stem-leaves sessile, and flowers in small terminal cymes or 
clusters: corolla funnelform, purplish, often hairy inside: stamens and style 
asin the previous subdivision: fructiferons peduncles erect: seeds meniscoidal, 
with a ridge across the hollowed inner face. 
7. H. purpurea LL. Pubescent or smooth, 2 to 4 dm. high: leaves varying from 
roundish-ovate to lanceolate, 3 to 5-ribbed: calyx-lobes longer than the half-free 
globular pod.—A wonderfully variable species of the Atlantic States, extending to 
Texas, and doubtless represented within our limit by some of its numerous forms. 
8. H. angustifolia Michx. Stems tufted from a hard or woody root: leaves narrowly 
linear, acute, 1-ribbed, many of them fascicled: flowers crowded, short-pedicelled: 
lobes of the corolla densely bearded inside: pod obovoid, acute at base, only its 
summit free.—Throughout Texas, Var, rILIroita Gray is diffuse, with cauline leaves 
mostly filiform, and flowers and pods smaller and more pedunculate.—Especially in 
the eastern half of Texas. War. RIGIDIUSCULA Gray is stouter, with leaves from 
linear to lanceolate and mostly rigid, and flowers disposed to be glomerate and ses- 
sile.—Southern and western Texas. 
§ 2. Fruticose or fruticulose, with setaceous or acerose-linear rigid and fascicled leaves, 
9. H. fasciculata Gray. From 7.5 to 30 cm. or more high, decidedly shrubby, 
with rigid and tortuous spreading branches, glabrous or hirtello-puberulent: leaves 
subulate-linear, 4 to 8 mm. long, much fascicled: flowers short-pedicelled: corolla 4 
to 6 mm. long, between salverform, and funnelform, the tube sometimes hardly or 
sometimes twice longer than the lobes: pod barely 2 mm. long, about one-third free: 
seeds 4 or5 in each cell, elongated-oblong, barely concave on ventral face.—West of 
the Pecos, 
10. H. acerosa Gray. From 7.5 to 15 em. high, fruticulose, tufted, with slender 
ascending branches: minutely hispidulous-pubescent or glabrate, very leafy through- 
out: leaves acicular-setaceous, 6 to 10 mm. long: calyx-lobes similarly setaceous: 
flowers sessile: corolla salverform with slightly dilated throat, its slender tube 6 to 
8mm. long, much exceeding the ovate lobes; pod over 2mm. long, globular, about 
