Part 1, 1916] CHENOPODIACEAE 79 
20. CORISPERMUM L. Sp. Pl. 4. 1753. 
Branched, glabrous or pubescent, annual herbs, the pubescence of stellate hairs. Leaves ses- 
sile, the blades narrow, entire, those of the inflorescence reduced to shorter but broader, scarious- 
margined bracts. Flowers perfect, solitary or glomerate in the axils of the bracts, arranged 
in dense or lax spikes. Perianth-segments 1-3, minute, unequal, the posterior one largest, erect, 
l-nerved, scarious, unchanged in fruit. Stamens 1-5, hypogynous, exserted; filaments un- 
equal, compressed. Ovary exserted; stigmas 2, recurved, connate at the base. Utricle elliptic 
to orbicular, plano-convex, indurate, the margin winged or merely acute, the pericarp mem- 
branaceous, adherent to the seed. Seed erect; embryo annular, surrounding the copious 
endosperm; radicle inferior. 
Type species, Corispermum hyssopifolium I,. 
Fruit distinctly wing-margined, the wing 0.5 mm. wide or more. . 
Fruit 2-3 mm. long; lower bracts much narrower than the fruit; spikes 
laxly flowered, slender. 1. C. nitidum. 
Fruit 3.5-4.5 mm. long; lower bracts usually equaling or broader than 
the fruit; spikes dense, stout. 2. C. hyssopifolium. 
Fruit not wing-margined. 
Plants glabrous; spikes slender, about 5 mm. in diameter; bracts 4-7 mm. 
long. ‘ 3. C. emarginatum. 
Plants pubescent; spikes stout, 5-10 mm. in diameter; bracts 4-15 mm. 
long. 4. C. villosum. 
1. Corispermum nitidum Kit.; Schultes, Oesterr. Fl. ed. 2. 1: 7. 
1814. 
Corispermum tenue Link, Jahrb. Gewdchsk. 13: 29. 1820. 
Corispermum microspermum Host, Fl. Austr. 1: 319. 1827. 
Corispermum hyssopifolium microcarpum S. Wats. Proc. Am. Acad. 9: 123. 1874. 
Plants much branched, 2-5 dm. high, the branches slender, spreading, smooth or striate, 
often tinged with red, glabrous or sparsely stellate-villous; leaf-blades narrowly linear, 1.5—6 cm. 
long, 1-2 mm. wide, cuspidate, glabrous or sparsely stellate-pubescent, ascending or spreading; 
spikes slender, usually laxly flowered, 3—4 mm. in diameter, the bracts commonly but little or 
not at all imbricate; upper bracts ovate or broadly ovate, 2-8 mm. long, acute or acuminate, 
cuspidate, scarious-margined, erect or spreading, as broad as the fruit, the lower bracts linear 
or linear-lanceolate, 8-20 mm. long, narrower than the fruit; fruit 2-3 mm. long, narrowly but 
conspicuously winged. 
Type LOcALIty: Hungary. 
DistrrurTion: Sandy fields, Illinois to North Dakota and Idaho, and southward to Texas and 
Arizona; also in Europe. . ; 
ILLUSTRATIONS: Sturm, Deuts. Fl. 67: pl. 3; T. Nees, Gen. Fl. Germ. Dicot. 1: pl. 75; Hegi, Ii. 
Fl. f. 555, h-m. 
2. Corispermum hyssopifolium L. Sp. Pl. 4. 1753. 
Corispermum hyssopifolium americanum Nutt. Gen. 1: 4. 1818. 
Corispermum americanum Nutt. ‘rans. Am. Phil. Soc. II. 5: 165. 1837. 
Corispermum marginale Rydb. Bull. Torrey Club 30: 247. 1903. 
Corispermum imbricatum A. Nelson; Coult. & Nels. Man. 164, 1909. 
Corispermum simplicissimum Lunell, Am. Midi. Nat. 1: 207. 1910. 
Stems slender, much branched, 1.5—6 dm. high, the branches spreading, striate, glabrous or 
stellate-villous, often tinged with red, sparsely leafy; leaf-blades linear, 1-7 cm. long, 1-3 mm. 
wide, cuspidate, glabrous or stellate-pubescent; spikes loosely or densely flowered, 4-8 mm. 
thick, the bracts often imbricate; bracts ovate or lanceolate, usually erect, 4-10 mm. long, acute 
or acuminate, stellate-pubescent or glabrate, the lowest longer and narrower, all except the 
lowest as broad as or broader than the fruit, these rarely narrower; fruit 3.5-4.5 mm. long, 
conspicuously winged. 
‘Types Ltocatiry: Along the Volga River, Russia. . ; ; 
DIstRIBUTION: Sandy flelds or beaches, Ontario to aie rca and southward to Missouri 
d Chihuahua; adventive in New York; also in Europe and Asia. ; 
ore Cee Pall. Fl. Ross pl. 98; Gaertn. Fruct. pl. 75; Lam. Tab. Encyce. 9l. 5; Sibth. Fi. 
Graeca #1. 1; E. & P. Nat. Pal. 318: f. 34, AE; Britt. & Brown, UN. FL f. 1388; ed. 2. f. 1705; Rob. & 
Fern. Man. }. 719; Clements, Rocky Mt. Fl. pl. 10, f. 13; Fiori & Paol. Ic. Fil. Ital. f. 1027; Hegi, Ill. 
Fi. f. 555, a-g. 
