584 FLORA OP TEXAS. 



simple compound or decompound umbel ; sjJikes linear- 

 lanceolate; scales ovate-lanceolate, mucronate, imbricated 

 in 4 rows; stamens 2; nut white, obovate, obtuse, often 

 warty. (Scirpus autumnalis, L.) Low grounds. Very 

 common. July-October. Annual. 



ISOLEPIS, E. Br. 



Spikes few-many-flowered; scales imbricated in few- 

 several rows; 'perianth none; style 3-cleft, the tumid base 

 persistent at the apex of the 3-angled nut. All annuals 

 (in our species), with filiform or bristle-form culms and 

 leaves ; spikes umbelled or clustered ; leaves radical. 



* Spikes umbelled. (Scales pubescent.) 



I. CAPiLLARis, R. and S. Ctdm (4'-G' high) smooth, 

 furrowed, and, like the rough-edged leaves, bristle-like; 

 spikes 3-4, in a single umbel, oblong, 6-8-flowered ; scales 

 oblong, obtuse, strongly keeled, brown on the sides, imbri- 

 cated in 4 rows ; 7iut obovate, obtuse, nearly equal-sided, 

 transversely wrinkled ; stamens 2. (Scirpus capillaris, L.) 

 Moist sandy places. June-September. Sheaths of the 

 leaves bearded at the throat ; involucre 2-3-leaved, scarcely 

 longer than the umbel. 



I. COARCTATA, Torr. Culms (1° high) terete, filiform ; 

 leaves bristle-form, smooth, with the sheaths bearded; 

 umhel compound, contracted; spikes (3" long) linear- 

 oblong, 10-15-flowered ; scales ovate, acutish, imbricated in 

 4 rows ; md flat on the inner face, obtuse-angled in front, 

 obscurely dotted. (Scirpus coarctatus, Ell.) Dry sandy 

 soil, near the coast. September and October. Bai/s of the 

 umbel ^' long. 



KHYNCHOSPORA, Vahl. Beak-rush. 



Spikes 1-several-flowered ; 5Crt/<?s imbricated in few rows, 

 the lowest empty, the upper usually bearing imperfect 



