422 MONOCOTYLEDONOUS PLANTS. 



11. C. phymatodes MM. : umbel simple or decompound ; involucre 

 3 9-leaved ; 3 of the leaves very long ; peduncles compressed ; spike- 

 lets distichous, linear, the lower one branched, about 15-flowered ; 

 sides rather convex ; glumes oblong, obtuse ; radicles tuberous at the 

 extremity. C. tuberosus Pursh. C. repens Ell. 



HAH. Moist grounds. N. Y. and Penn. Aug If. Root creep- 

 ing. Cvlm 12 18 inches high. Leaves radical. Spihdets linear- 

 elongated, many flowered. .' 



12. C. compressus Linn. : spikes digitate, somewhat by fours, lan- 

 ceolate ; glumes mucronate, broad, memUranaceous. 



HAB. Low meadows. Penn. to Car. Pitrsh. July. 2J.. Culm 

 3 8 inches high. Spikelcts nearly sessile, many -flowered. 



13. C. firms Mich. : culm acutely triangular; umbels decompound; 

 npikelets ovate-lanceolate, in compact head* ; involucre very long. 



HAB. Meadows. Penn. to Geor. Sept. U.Culm 12 feet 

 high. Spikelets many-flowered, laterally compressed into com- 

 pact heads. 



14. C. mariscoides EU. : umbel simple, or with 1 2 rays; spikelets 

 collected into globose heads, linear, 7 8-flowered ; glumes loose, ob- 

 tuse. Scirpus cypertformis Muhl. 



HAB. Rocky grounds. Mass, to Car. W. to Miss. Aug. 2^. 

 Root a solid bulb. Culm 8 10 inches high. Spikelets crowd- 

 ed into hard dense heads. 



15. C. odoratus Linn. : spikelets corymbed, subulate, remote, disti- 

 chous; glumes somewhat distant; smaller umbels spreading widely, 

 about the length of their involucels. 



HAB. Banks of rivers. Penn. to Flor. ; rare. Aug. If. Pursh. 



16. C. flavicomis Mich. : culm triquetrous; umbel compound ; spikes 

 linear-lanceolate, 7-flowered ; glumes obtuse ; involucre very long, re- 

 flexed. 



HAB. Boggy woods. Penn. to Car. Pursh. July. If. Culm, 

 erect, smooth. Spikes distichous, oblong, compressed, yellow. 



2. DULICHIUM. Rich. 



Spikes somewhat racemose, axillary ; spikelets linear-lan- 

 ceolate, rather compressed. Glumes distichous, sheathing. 

 Style very long, bifid ; base persistent. Nut with bristles at 

 the base. Triandria. Monogy/iia. 



D. spathaceum Pers : culm terete ; leaves spreading in three direc- 

 tions ; spikelets spreading. Schocnus spathaccus Linn. Scirpus spatha- 

 ecus Mich. 



HAB. Swamps and ponds. Throughout the U. S. Aug. If. 

 Culm 18 inches high, round below, triangular above. Leaves 

 linear, flat. Flowers in subulate spikelets, forming axillary ra- 



