469 
to 30-flowered (6 mm, long): scales ovate, obtuse, chestnut-purple with a broad sca- 
rious margin and green keel: bristles (2to 4 or none) halfas long as the achene which 
is obovate, roughish wrinkled, and crowned with a small depressed tubercle.— 
Throughout the eastern United States and extending into eastern Texas. 
15. E. montana R. & 8S. Stems very slender, suleate, 15 to 45 em. high, from 
rather slender running rootstocks: spikes ovate or usually oblong, 4 to 10mm. long; 
the numerous closely imbricated scales ovate and very obtuse, brown with greenish 
midvein and pale border: bristles 4 or 6, about equaling the very obtusely trian- 
gular oblong-obovate achene (nearly 1 mm. long): tubercle much broader than the 
apex of the achene, thick, deltoid, acute. (£. Dombeyana Kunth. £. arenicola Torr. 
i. truneata Sch).)\—Throughout the southern United States, from South Carolina and 
Florida to southern California, and southward into Mexico. 
16. EB. cylindrica Buckley. Stems very slender, spikes linear, terete or slightly 
compressed, acutish, 12 to 18 mm. long: scales very numerous, the lowest ovate and 
obtusish, the others ovate-lanceolate and acute, all with broad hyaline margins: 
bristles none: stamens 3: achene obovoid, contracted at the neck, tipped with a 
conical acute tubercle. (4. Terana Britton.)—Valley of the lower Rio Grande. 
17. B. rostellata Torr. Stem compressed, filiform, sulcate, 3 to4 dm. high: spike 
ovate-lanceolate, acute, 12 to 20-flowered, 6 to 8 mm. long: scales ovate, obtuse, 
loose, somewhat cartilaginous, light-brown with scarious margin: bristles 4 to 6, 
strong, conspicuously scabrous, longer than the minutely roughened achene; tubercle 
conical-beaked, rather obtuse.—Throughout the United States and southward 
through Texas into Mexico. 
5. DICHROMENA Richard. 
Stems leafy, from creeping perennial rootstocks, with involueral 
leaves mostly white at base, more or less compressed few-flowered 
(all but 3 or 4 of the flowers usually imperfect or abortive) spikelets 
aggregated in a terminal leafy-involucrate head, imbricate more or less 
keeled white or whitish scales, no bristles, 3 stamens, 2-cleft style and 
a lenticular transversely wrinkled achene crowned with the persistent 
and broad tubercled base of the style. 
1. D. cephalotes Britton. Stem triangular, 3to6dm. high: leaves narrow, those 
of the involucre 4 to 7: achene truncate, not margined. (D. leuwcocephala Michx.)— 
Pine barrens of the Atlantic coast, and extending through eastern Texas to the val- 
ley of the lower Rio Grande. 
2. D. latifolia Baldwin. Stem stouter, nearly terete: leaves broadly linear, those 
of the involuere 8 or 9, tapering from base to apex: achene round-obovate, faintly 
wrinkled, the tubercle decurrent on its edges.—A south Atlantic species, collected 
in the vicinity of Sabine Pass. 
3. D. nivea Beckl. Stem nearly terete, 10 to 25 em, high: leaves very narrow, 
almost capillary, those of the involucre 2, slender and unequal, dilated and whitened 
at base: scales keeled and white: achene strongly wrinkled, round-obovate, very 
convex, the tubercle decurrent on both edges to and around the base of the nut 
(giving it an annulated appearance at base). (D. Reverchoni 8S. H. Wright.)—Texas 
and Arkansas. 
6. FIMBRISTYLIS Vahl. 
Stems leafy at base, with several to many-flowered terete spikelets in 
umbels or heads, a 2 or 3-leaved involucre, scales (all floriferous) regu- 
larly imbricated in several ranks, no bristles, 1 to 3 stamens, and a 2 
or 3-cleft style often with a dilated or tumid base which is deciduous 
(except in F. capillaris) from the apex of the naked lenticular or trian- 
guar achene. 
11874—No, 3——9 
