FOUR-O'CLOCK FAMILY 257 



4. A. ammophila Greene. Glandular-piiborulent perennial; stem 3-4 dm. 

 high, decumbent, branched; leaf-blades 1.5-2 cm. long, oblong-elliptic, obtnse, 

 tliick: flowers greenish or yellowish wliite; fruit bi-turbinate, with about 5 low 

 rounded crests. A, arenaria Rydb. A. cheradophila A. Nels. A. Nelsonii 

 Heimcrl. Sandy places: Yellowstone Park. SuhmoiiL — Mont. Au. 



5. A. nana S. Wats. Dwarf cespitose perennial, with thick caudex; stems 

 less than 1 dm. long; leaf-blades 8-20 mm. long, oval, rough-pubendent; invo- 

 lucres of 4 or 5, ovate or lanceolate bracts, 6-10 mm. long; flowers greenish, 12- 

 14 mm. long; fruit cuneate-turbinate, with 5 hollow wings. Dry ravines and 

 valleys: s Utah — Ariz. — Calif. Son. Je. 



6. A. salsa T?ydb. Perennial; stem ascending, 3-4 dm. high, densely viscid- 

 pubescent; leaf -blades oval or elliptic, ver>' thick, puberulent, obtuse, or the lowest 

 rounded-oval, 3-5 cm. long, 1-3 cm. wide; bracts about 15 mm. long; flowers 

 many, about 2 cm. long; limb about 4 mm. wide; fruit about 1 cm, long. Sandy 

 beaches of salt lakes: Utah. SoJi, IMy-Jl. 



7. A. fallax Ileimerl. Perennial; stem erect, almost shrubby below, branched, 

 straw-color or white, viscid-pubescent above; leaf-blades thick, puberulent, oval, 

 those of the upper long-lanceolate, 2-5 cm. long, 1-1,5 cm. wide; flowers many, 

 about 15 mm, long; fruit with the wmgs about 6 mm. wide and 8 mm. long, 

 cuneate-obpjTamidal. Sand^' places: Utah. Son. Au. 



8. A. elliptica A. NeLs. Perennial, with a thick root; stems several, ascend- 

 ing, 1-3 dm. long; leaf-blades fleshy, glabrous, elliptic or oval, 1.5-3 cm. long; 

 bracts obovate, subacute, 8-15 mm. long; flowers greenish white, 15-20 mm. long; 

 fruit obscurely pubescent, turbinate, truncate or somewhat obcordate, with 5 

 wings, 7 mm. long. Clay hills: Wyo. — Colo. — Utah. Son. — SubmonL My-Jl. 



9. A. glabra Rydb. Perennial; stem ascending, about half a meter high; 

 leaf-blades oval to oblong, thick, 1-4 cm. long, obtuse; bracts obovate, about 

 5 mm. long, acute; flowers 12-15 mm. long, numerous; fruit cuneate-obpyramidal, 

 with the wings 4-5 mm. wide; wings very thick, of two lamina, semi-cordate at 

 the apex. Arid places: Colo. Son. Jl. 



10. A. lanceolata Rydb. Perennial; stem glabrous, decumbent, several 

 decimeters long; leaf -blades oblong-oval, rather thick, glabrous, 2-5 cm. long, 

 1-1.5 cm. wide; bracts 6-8, lanceolate, about 1 cm. long; flowers numerous, 

 about 1.5 cm. long, with a limb 4^5 mm. wide; fruit with the thin wings about 

 8 mm. wide, cuneate-obpyramidal. Drifting sand: Ida. Son, Jl. 



11. A. Carletoni Coult. & Fisher. Perennial, with a thick root; stems 

 decumbent, glandular-puberulent, 2.5-4 dm. high; leaf-blades thick, Unear-oblong 

 or oblong-ovate, 3-5 cm. long; bracts rose-colored, 6 mm. long; flowers rose-colored; 

 fruit turbinate, with 5 coarsely reticulate wings. Plains: Colo. Pkiin. My-Je. 



12. A. viUosa S. Wats. Perennial; stems weak and slender, decumbent or 

 ascending, densely villous; leaf-blades 0.5-3 cm. long, ovate or elhptic, obtuse 

 or acute; bracts 6-8 mm. long; flowers pink, 15-20 mm. long; frmt with 3-o 

 broad wings, membranous, with a sunple lamina, truncate above. Sandy places: 

 Ariz. — s Utah— Calif. L. Son. Ap-Au. 



2. TRIPTEROCALYX Hook. Saxd Puffs. 



Branched annuals, with opposite petioled leaves. Blades entire and usually 

 oblique at the base. Flowers perfect, in heads surrounded by 4-6 dktmct bracts. 

 Perianth corolla-Uke, salverform, ^\ith elongated tube and 5-lobed limb, bta- 

 mens 5, regularly adnate to the perianth-tube. Fruit almost orbicular m out- 

 line, completely surrounded by 2-4, strongly reticulate, membranous wmgs. 

 Seeds cylindric-elhpsoid. 

 Flowers 3 cm. or more long; limb about 1 cm. ^"ide; peduncles ^'^'^^^\^^^ ^^^^J-^J^^[ 



Flowers 1.5-2 cm. long; limb about 5 inm. fide. i^.,,,^ 



Stem glabrous or nearly so; peduncles often nearly equalling the ^^-^^^^^^^^1^^^^. 



Stem denselv oubescent; peduncles at least in flower much shoi 



3. T. micranthus 



12* 



