117 
2. Stigma discoid: calyx-tube more broadly dilated above: anthers oblon -linear: 
f g 
capsule mostly sessile, linear-cylindric : mostly perennial, somewhat woody, with axillary 
yellow flowers erect in bud. 
20. Ch. Hartwegi Benth. Suffruticose, usually low, 7.5 to 37.5 em. high, decumbent 
or ascending, branched, more or less canescent or glabrous: leaves numerous, often 
crowded, linear to lanceolate, 1 to 5 em. long, obtuse or acutish, entire or sometimes 
sparingly repand-denticulate: calyx-tube 2.5 to 5 em. long, the tips free and linear: 
petals 8 to 24 mm. long: capsule 16 to 20 mm. long.—Throughout the whole Rio 
Grande region of Texas, and northward to Indian Territory. The following well- 
marked varieties are chietly in western Texas: Var, LAVANDULEFOLIA Watson. 
Low, 7.5 to 15 em. high, pubescent throughout, the leaves mostly linear, 6 to 24 mm. 
long, the calyx-segments less attenuated above. (, lavandulafolia Torr and Gray.) 
Var. FENDLERI Watson. Stouter, mostly glabrous, with oblong-lanceolate leaves 
and large flowers with a broad throat. (i. Fendleri Gray.) 
21 Ci. Greggii Gray. Very near the last, but more shrubby and diffuse, low, 
viscidly pubescent or more or less hirsute: leaves ovate to oblong, 2 to 6 mm. long, 
acute, mostly sessile: flowers smaller: capsules 12mm. long.—Sandy plains and 
stony hills west of the Pecos; also reported by Reverchon from prairies near the 
Lampasas. 
22. Ci. tubicula Gray. Usnally subwoody, diffusely branched, 10 to 30 em. high, 
minutely glandular-puberulent; leaves linear to oblong-lanceolate, 12 to 24 mm, 
long, acute, entire, the lower petioled : calyx-tube 8 to 14 mm. long, the free tips 
short: petals 8 to 10 mm. long: capsules 8 to 14 mm. long, subpedicellate.—Prairies 
and gravelly places on the Pecos and westward ; also extending through northwestern 
Texas. 
23, CH. serrulata Nutt. Slender, 7.5 to 37.5 em. high, simple or branched, canescent 
with short appressed hairs or nearly glabrous: leaves linear to lanceolate, 2.5 to 7.5 
cm. long, mostly acute or acutish, attenuate to the base, irregularly and sharply den- 
ticulate: calyx-tube 4 to 8 mm. long, the free tips short : capsules 18 to 30 mm. long.— 
Throughout Texas. The following varieties have almost equal range in Texas: 
Var. SPINULOSA Torr. & Gray. Usually nearly glabrous, the. stems rather stout, 
subdecumbent, sometimes 6 to 9 dm. long: flowers larger, the tube 12 to 20 mm, 
long, with a slender base and equaling the petals: stigma and throat of the calyx 
occasionally very dark-purple or orange. Var. PINIFOLIA Engelm. has leaves very 
narrowly linear and subrevolute and flowers as in the former variety. 
§ 3. Stigma capitate: calyx-tube obconic or short-funnelform : anthers oblong : capsule 
linear, sessile, attenuated above, curved and contorted : Jlowers in bracteate spikes. 
24. Gi. chamenerioides Gray. Slender, erect, branching, 10 to 30 em. high, some- 
what viscidly puberulent: leaves distant, lanceolate, 2.5 to5 em. long, the uppermost 
sessile, the lower petioled, obscurely repand-denticulate: flowers small, petals 2 mm. 
long, yellow, usually turning red: calyx-tube very short: capsule elongated, very 
narrowly linear, 3 to5 cm. long, 1 mm. thick.—Stony hills, beyond the Pecos in ex- 
treme western Texas, 
5. GAURA L. 
Herbs, with mostly sessile alternate leaves, white or rose-colored 
flowers in spikes or racemes, an obconical deciduous calyx-tube much 
prolonged beyond the ovary and with 4 reflexed lobes, clawed petals, 
mostly 8 stamens with a small seale-like appendage before the base of 
each filament, a 4-lobed stigma surrounded by a ring or cup-like border, 
and a hard nut-like 3 to 4-ribbed or angled truit which is indehiscent 
or nearly so and usually becoming 1-celled and 1 to 4-seeded. 
