. Gray's new manual of botany. A handbook of the flowering plants and ferns of the central and northeastern United States and adjacent Canada. Botany. 3-nerved. (O. calcaratus Nees.) — Wet places, Del. to Fla. and Tex.; northTV in the flat country to Mo. and Kan. Tig. 211. 13. C. Fuscus L. Low (1-3 dm. high) ; spikelets linear, 3-8 mm. long, the thin brown scales (greenish (inly on the keel) very faintly nerved; stamens 2 ; aclienes equaling the scales. — Locally on ballast, Mass. to N. J. (Adv. from Eu.) Fig. 212. 14. C. Mspan L. Culms sharply angled (2-8 dm. high) ; leaves linear, often redu
. Gray's new manual of botany. A handbook of the flowering plants and ferns of the central and northeastern United States and adjacent Canada. Botany. 3-nerved. (O. calcaratus Nees.) — Wet places, Del. to Fla. and Tex.; northTV in the flat country to Mo. and Kan. Tig. 211. 13. C. Fuscus L. Low (1-3 dm. high) ; spikelets linear, 3-8 mm. long, the thin brown scales (greenish (inly on the keel) very faintly nerved; stamens 2 ; aclienes equaling the scales. — Locally on ballast, Mass. to N. J. (Adv. from Eu.) Fig. 212. 14. C. Mspan L. Culms sharply angled (2-8 dm. high) ; leaves linear, often reduced to membranous sheaths ; umbel spreading, the filiform rays mostly longer than the 2-leaved involucre ; spikelets narrowly linear; scales light reddish-brown, oblong, mucronate, 3-nerved ; ^jg g haspan wings of rhaohilla persistently attached ; achenes round- obovoid. —Ponds and ditches, Va. to Fla. and Tex. Fig. 213. 15. C. dentJltus Torr. Perennial by slender rootstocks and tuber-bearing stolons; culms slender (1-6 dm. high) ; leaves rigid and keeled; umbel erect, shorter than the 3-4- leaved involucre; spikelets 5-13-flowered ; scales reddish- brown, with green keel, ovate, acute, 1-nerved, the mucronate tips prominent. — Sandy shores, Me. to , and southw. — Spikelets often abortive and changed into leafy tufts. Fig. 214. Var. cten(5stachys Fernald. Spikelets 15- 40-flowered ; scale-tips less prominent. — Mass. to N. J. Fig. 215. 16. C. rotiindus L. (Nut Ghass.)* Peren- nial by tuber-bearing stolons ; culm slender (1-6 dm. high), longer than the leaves; umbel simple or slightly compound, about equaling the involucre ; the few rays each bearing 4-9 dark chest- nut-purple 12-40-flowered acute spikelets ( cm. long) ; scales ovate, closely oppressed, nerveless except on the keel; achenes linear- oblong. — Sandy fields, Va. to Fla. and Tex. ; also adv. near Phila. and N. Y. City. (Trop. and subtrop. regions.) Fig. 216. 17. C. Hdllii Britton. Similar; c
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