MOXOCOTYLEDOXOUS OR ENDOGENOUS PLANTS. (">;:. 



ing or reflexed, linear-subulate, terete, 10-12-llowered; 

 scales scattered on the short-jointed broadly-winged rachis, 

 oblong, obtuse, faintly-nerved, appressed ; nut oblong, 

 compressed-3-angled ; culms slender, obtuse-angled; invo- 

 lucre 4-6-leaved. (C. speciosus, Vahl. ?) Swamps and 

 ditches. August and September. Culm 2°-3° high; 

 spikelets ^"~'^" long, flexuous in fruit. Annual. 



Glomerati. Umbel simple or compound ; spikelets many-flowered, compressed, numer- 

 ous in cluster, forming more or less dense heads at the summit of the common and 

 partial rays ; rachis wingless ; stamens solitary. 



* Umbel compound ; spikelets ovate or oblong, flat ; scales Z-ntrved. concave on the back, 

 acute ; nut minute, lanceolate or oblong. 



C. VEGETUS, "Willd. Umbel often decompound, many- 

 rayed, widely spreading; involucre 4-leaved, many times 

 longer than the nmbel ; spikeUts short (l|^"-2" long), 

 ovate, 10-15-flowered, very numerous in the heads ; scales 

 lanceolate, incurved, spreading at the apex ; mit minute, 

 linear-lanceolate, slender-pointed ; culms slender (2°-3° 

 high), obtuse-angled or nearly terete ; leaves narroAV, rigid, 

 rough on the margins near the summit. Low pine-barrens 

 and margins of ponds. September. Culms tumid at the 

 base ; leaves of the involucre horizontal ; heads light 

 brown. Perennial. 



C. Drummondii, Torr. Umhel compound, of 4-G pri- 

 mary rays, and as many smaller ones, shorter than the 

 4:-leaved involucre; spikelets (10-20 in a cluster) oblong 

 or oblong-linear, 40-50 flowered ; scales yellowish, ovate, 

 straight, free at the apex : nut oblong, pointed, abruptly 

 contracted at the base, minutely Avrinkled ; culms (6-15' 

 high) obtuse-angled, very rough, longer than the narrow 

 leaves. Sandy swamps. September. Annual. 



Capitati. Umbel simple or sessile ; spikelets inserted on all sides of the common rachis, 

 forming clusters or heads; joints of the rachis mostly toinged ; scales rigid, S-ll- 

 nerved ; stamens 3. 



* Spikelets few in loose clusters. 



C, FlUFORMis, Sw^artz. Clusters sessile ; spikelets 6-12, 



