164 CHENOPODIACEAE (GOOSEFOOT FAMILY) 



lax in fruit: utricle narrowly but clearly winged, about 2 mm. broad and 

 usually broader than the subtending leaf or bract. C. hyssopifolium. 

 Throughout the middle west. 



2. Corispennum marginale Rydb. Bull. Torr. Bot. Club 30: 247. 1903. 

 Annual; stem glabrous, much branched, 2-5 dm. high: leaves narrowly linear, 

 2-5 cm. long, 1.5-2 mm. wide: spike 3-8 cm. long, rather dense: bracts usually 

 overlapping each other, the lower lanceolate, about 1 cm. long, the upper 

 ovate, 5 mm. long, all more or less acuminate, with a strong midrib and con- 

 spicuous scarious margins, slightly pubescent when young or glabrate: fruit 

 about 4 mm. long and 2.5 mm. wide, with a broad wing-margin. Wyoming to 

 New Mexico. 



3. Corispermum imbricatum A. Nels. Very glabrous throughout; branches 

 spreading from the crown of the annual root, 1-2 dm. long, simple, spike-like 

 and floriferous nearly to the base: leaves crowded-imbricate, lanceolate to 

 ovate, 7-15 mm. long, broadly scarious-margined : fruit oval, about 3 mnv 

 long, narrow wing-like margin, yellowish. Characters much like the preceding 

 but of very different habit. Southeastern Wyoming. 



4. Corispermum emarginatum Rydb. Bull. Torr. Bot. Club 31: 404. 1904. 

 Annual, perfectly glabrous or with a few hairs on the bracts, branched near 

 the base, 3-4 dm. high: leaves narrowly linear, 2-4 cm. long, 1-2 mm. wide, 

 cuspidate-pointed: bracts except the lowest ovate, 5-7 mm. long, acuminate, 

 scarious-margined, much broader than the fruit: fruit plano-convex, 2.5-3 mm. 

 long and about 2 mm. wide, almost without a trace of a wing-margin. Wy- 

 oming and Colorado. 



5. Corispermum villosum Rydb. Bull. Torr. Bot. Club 24: 191. 1897. 

 Stem 2-4 dm. high, much branched from near the base, the branches diver- 

 gent, striate, when young with the leaves and bracts villous with many 

 branched hairs, in age glabrate: leaves linear, 2-4 cm. long, 1-3 mm. wide, 

 cuspidate-mucronate : spikes rather dense, with more or less imbricated bracts: 

 lower bracts linear-lanceolate, 5-10 cm. long, the upper ovate-acuminate and 

 cuspidate, 4-5 mm. long and about 3 mm. wide, with broad scarious margin: 

 achene 2-2.5 mm. long and 2 mm. wide, acutely margined but scarcely at all 

 winged. Throughout our range. 



5. CYCLOLOMA Moq. 



An erect herbaceous annual with thin leaves and small flowers in inter- 

 rupted panicled spikes. Flowers perfect or pistillate; the urn-shaped calyx 

 with 5 concave acute carinate lobes, around the base of which develops a mem- 

 branous wing. Stamens 5. Styles 3. Seed lenticular. 



1. Cycloloma atriplicifolium (Spreng.) Coult. Mem. Torr. Club 5: 143. 

 1894. More or less arachnoid-pubescent, becoming glabrate, diffusely 

 branched, 1-3 dm. high, generally light green or purple-tinged: leaves lanceo- 

 late, acute, coarsely sinuate-toothed, on slender petioles: calyx cleft to the 

 middle, 4 mm. broad, including the irregular wing, wholly covering the 

 utricle. C. platyphyllum Moq. Throughout our range in sandy soil; not com- 

 mon. 



6. KOCHIA Roth 



Low plants from a shrubby base, with terete leaves. Flowers solitary or 

 few in the axils, with globose, transversely winged perianth, 5 usually exserted 

 stamens, a depressed ovary, and 2 filiform styles. The pericarp membranous. 



Glabrate at maturity 1. K. americana. 



Villous or subtomentose . . . . . . . . . 2. K. vestita. 



1. Kochia americana Wats. Proc. Am. Acad. 9: 93. 1874. Branching at 

 base; stems villous-tomentose or nearly glabrous: flowers 1-3 in the axils, 

 mostly with abortive stamens: perianth densely white-tomentose, persistent; 

 lobes of the membranous wing cuneate-rounded, nerved and somewhat crenu- 



