258 NYCTAGINACEAE 



1. T. cyclopterus (A. Gray) Standi. Annual; stem stout, 2-5 dm. long, 

 puberulent; leaf-blades elliptic, lance-elliptic, or oval, 2-5 cm. long, more or less 

 pubescent; bracts lanceolate, 8-10 mm. long; fruit with the wings 2-3 cm. in 

 diameter, emarginate at each end; body usually 3-nerved. Ahronia cycloptera 

 A. Gray. Plains: Tex. — Colo. — Calif. Son. IMy-Au. 



2. T. pedunculatus (M. E. Jones) Standi. Annual; stem 2-3 dm. long, 

 glabrous or nearly so; leaf-blades elliptic or oval, 2-5 cm. long; bracts ovate, 

 about 4 mm. long, acuminate or abruptly acute; fruit about 18 mm. long, often 

 red; body 3-nerved. A. micrantha pedunculata M. E. Jones. Perhaps not 

 specifically distinct from the next. Sandy or gravelly places : Utah. Son. Ap- Je. 



3. T. micranthus (Torr.) Hook. Annual; stem branched at the base, 

 decumbent or ascending, 1-3 dm. high, more or less pubescent; l«af -blades 2-4 

 cm. long, elliptic, about equalling the petioles; bracts ovate, acmninate, 4-5 mm. 

 long; fruit with the wings 1-1.5 (rarely 2) cm. broad; body spongy-reticulate, 

 not nerved. A. micrantha Torr. Drv plains and in sandy soil: Sask. — Kans. — • 

 N.M.— Mont. Plain— Mont. My-jl. 



3. SELINOCARPUS A. Gray. 



Perennial herbs or somewhat shrubby plants. Leaves opposite, thick and 

 sometimes fleshy. Flowers solitary in the axils of the leaves or clustered at the 

 ends of the branches. Bracts when present small and inconspicuous, distinct. 

 Perianth funnelform with a spreading limb. Stamens 2-5, exserted. Fruit 

 with 3-5 prominent membranous wings. 



1. S. diffusus A. Gray. Perennial, with a woody caudex, cespitose at the 

 base; stems 1-2 dm. high, scabrou.s-hispidulous, canescent; leaf-blades ovate to 

 suborbicular [var. nrvadensis Standi.] obtu.se, 1-3 cm. long, hispidulous on both 

 sides; flowers about 3 cm. long, greenish, hispidulous; fruit about 7 mm. long; 

 w^ngs 2 mm. wide. Arid regions: Tex. — s Utah. L. Son. 



4. HERMIDIUM S. Wats. 



Perennial glabrous herbs, with entire, opposite, short-petioled leaves. Flow- 

 ers perfect, 3 together, subtended by as many leaf-like distinct bracts. Perianth 

 campanulate, purplish, slightly lobed. Stamens 5-7, about as long as the peri- 

 anth. Fruit subglobose, smooth, glabrous. Seed enclosed in the pericarp. 



1. H. alipes S. Wats. Stem stout, ascending, 3-6 dm. high; leaf-blades 

 2-6 cm. long, broadly ovate, subcordate, short-petioled; bracts 12-20 mm. long, 

 ovate-cordate, acute, more or less colored; heads about 6-flowered; calyx cam- 

 panulate, light purple, somewhat 5-lobed; fruit globular, narrowly 3-winged. 

 Foot-hills: Utah— Nev.— Calif. Son. My. 



5. QUAMOCLIDION Choisy. Four-o'clock. 



Perennial herbs, with opposite, thick, entire leaves. Flowers perfect, usually 

 large, several in umbels, surrounded by a gamophyllous involucre. Periantli 

 corolla-like, funnelform or trumpet-shaped. Stamens 5, exserted. Fruit liard, 

 smooth, ellipsoid or .subglobose, glabrous. Pericarp adherent to the seed. 



1. Q. multiflorum Torr. Perennial, with a thick root; stem stout, spread- 

 ing or ascending, 6-10 dm. long; leaf-blades broadly ovate or subcordate, acute, 

 3-7 cm. long; involucre large, its bracts imited half way uj) or further, acute or 

 acuminate; heads usually 6-flowered; periantli broadly funnelform, rose-colored 

 to purple, 4-5 cm. long; fruit ovate-oblong, 6-8 mm. long, 10-furrowed toward 

 the base. Mirahilis mulliflora A. Gray. Valleys: Tex. — Colo. — Utah — Calif. 

 Son. — Mont. Jc-S. 



6. HESPERONIA Standi. 



Perennial herbs, with ojiijositc, entire leaves. Involucres campanulate, of 

 5 bracts united at their base, not enlarged in fruit, l^'lowers solitary in each 

 involucre. Perianth campanulate, white or purplish. Stamens usually 5, distinct. 

 Fruit ellipsoid or globose, neither angled nor ribbed, glabrous. 



