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6. STENOSIPHON Spach. 
Like Gaura, but calyx prolonged beyond the ovary into a filiform 
tube, the filaments not appendaged at base, and the fruit 1-celled and 
1-seeded. 
Ls. virgatus Spach. Slender, 6 to 12 dm. high, glabrous, leafy: leaves narrowly 
lanceolate to linear, pointed, entire, much reduced above: flowers numerous in an 
elongated spike, white, 12 mm. long: fruit pubescent, oblong-ovate, 8-ribbed, sma]l.— 
Extending from the north as far south as Wilson County, 
LOASEZ. (LOASA FAMILY), 
Herbs, with either stinging or jointed and rough-barbed hairs, no 
stipules, calyx-tube adnate to a 1-celled ovary, perfect often showy 
flowers, usually very numerous stamens, and a single style. 
1. Mentzelia, Stamens many, inserted below the petals: style 3-cleft at apex: seeds 
few to many, on 3 parietal placentie. 
%. Bucnide. Stamens many, adnate to the united bases of the petals and decidu- 
ous with them in a ring: style 5-cleft: seeds minute, very numerous, covering 5 
expanded placentie. 
3. Cevallia. Stamens 5, adnate to base of calyx-segments and persistent, the con- 
nective prolonged into a linear tubular petaloid appendage: style short, with a capi- 
tate stigma: seed solitary, suspended. 
1. MENTZELIA Plumier. 
Annual or biennial erect herbs, with stems becoming white and shin- 
ing, alternate leaves very adhesive by the barbed pubescence, terminal 
solitary or cymose-clustered yellowish or white flowers, cylindrical or 
club shaped calyx-tube with a 5-parted persistent limb, 5 or 10 regular 
_ Spreading flat deciduous petals, usually indefinite stamens inserted with 
the petals on the throat of the calyx, a 3-cleft style, and a dry few to - 
many-seeded capsule opening by valves or irregularly at summit. 
* Seeds few or many, not winged: petals 5, not large: filaments all filiform. 
1. M. oligosperma Nutt. Rough and adhesive, 3 to 9 dm. high, much branched, 
branches brittle: leaves ovate and oblong, cut-toothed or angled, petioled ; petals 
yellow, wedge-oblong, pointed: capsule about 9-seeded, seeds oblong.—Throughout 
western Texas. 
2. M. albicaulis Dougi. Slender, 7.5 to 30 em. or more high: leaves linear-lanceo- 
late, pinnatifid with numerous narrow lobes, sessile, upper leaves broader: flowers 
mostly approximate near the ends of the branches: petals spatulate or obovate: 
capsules linear-clavate, with numerous seeds, which are rather strongly tubereulate 
and irregularly angled with obtuse margins.—In the mountains west of the Pecos. 
* * Seeds numerous, suborbicular-winged or narrowly margined : petals 5 or 10, often large 
and showy: outer filaments often petaloid: capsule broad, oblong: leaves sessile, sinu- 
ately-toothed or pinnatifid. 
3. M. nuda Torr. & Gray. Rough with minute barbed pubescence: leaves some- 
what lanceolate, the segments obtuse: flowers vespertine, yellowish-white, rather 
large, not bracteolate: petals 10: outer filaments petaloid and often sterile : capsule 
3-valved at summit: seeds plainly winged.—Sandy plains of southern and western 
Texas. 
