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2. C. Greggii Gray. Suffruticulose, 3 to 6 dm. high, tomentose-canescent: leaves 
4to8mm. long, ovate or oval, short-petioled, almost veinless, entire, the margins 
revolute: flowers capitate-glomerate at summit of branches: calyx-lobes filiform 
from a broader base, elongated-plumose with long villous hairs: stamens equally or 
unequally inserted: ovary obscurely d-lobed: fruit even, ovate-oblong, by abortion 
l-celled and 1-seeded, the walls comparatively thin.—Rocky ravines, beyond the 
Pecos, The conspicuous and villous sepals give the flower-heads a strikingly plu- 
ose appearance. 
3. C. hispidissima Gray. Suffruticulose, diffuse, soon procumbent, very setose- 
hispid, and with some minute cinereous pubescence: leaves fascicled, rigid, lanceolate, 
soon linear or acerose by strong revolution of the margins: the lower or primary 
ones petioled: flowers scattered: calyx-lobes linear, resembling the leaves: stamens 
unequally inserted: truit deeply 4-lobed, the mature nutlets rounded and only ven- 
trally united, rough-granulate.—Dry hills, western Texas. 
4. TOURNEFORTIA L. 
Shrubby, with small white flowers in one-sided spikes, and a drupa- 
ceous fruit; otherwise like Heliotropium. 
1. T mollis Gray. Erect, 3 dm. or less high, canescently silky-tomentose: leaves 
deltoid or rhombic-ovate, obtuse, with undulate margins, rather long-petioled: flow- 
ers crowded ina pair of naked peduncled spikes: corolla-lobes bread, undulate or 
crenulate, (Heliophytum molle Torr. Mex. Bound.)—Arid plains of southwestern 
Texas. 
5. HELIOTROPIUM Tourn. (TOURNSOLE. HELIOTROPE.) 
Herbs or low shrubby plants, with entire leaves, salverform or fun- 
nelform unappendaged corolla, nearly sessile anthers, short style with 
conical or capitate stigma, and 2 to 4-lebed fruit separating into 2 in- 
durated 2-celled and 2-seeded closed carpels or more commonly into 
four 1 -seeded nutlets. 
* Fruit didymous, the 2 carpels each splitting into two I-seeded nutlets: style elongated: 
flowers scattered, large. 
1. H. convolvulaceum Gray. Low annual, strigose-hirsute and hoary, much 
branched: leaves lanceolate, or ovate or even linear, short-petioled: flowers oppo- 
site the leaves and terminal: corolla 12 mim. broad, the strigose-hirsute tube about 
twice as long as the linear sepals.—Sandy plains of the north and extending to south- 
ern and western Texas. A showy plant with sweet-scented flowers. 
** Fyuit 4-lobed, separating into four t-celled 1-seeded nutlets: style short. 
+ Flowers in more or less bracteate spikes (which are little if at all scorpivid ) or scattered. 
2. H. Greggii Torr. Diffusely spreading from a somewhat woody base, strigose- 
cinereous: slender branches leafy: leaves narrowly linear, flat, about 2.5 em. long: 
flowers very fragrant, short-pediceled or nearly sessile in an at first crowded and 
short scorpioid spike, with or without bracts: calyx-lobes similar: corolla white, 
with an ample limb and naked and open throat: anther-tips minutely bearded, acu- 
minate.—Sandy soil, western borders of ‘Texas. 
3. H. angustifolium Torr. Erect and deusely branched from a woody base, stri- 
gose-canescent: branches rigid, very leafy: leaves very narrowly linear, with revo- 
lute margins, almost filiform when dry, 8 to 18 min, long: spike few-flowered, at 
length slender, nearly straight, with or without bracts at base: calyx-lobes similar: 
corolla white, salverform, with narrow canescent tube, very small limb, and open 
throat: anther-tips glabrous, mucronate.—Southwestern borders of Texas, 
