. 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. 219, C. erythrorhizos. 220. C. ferax. 19. C. erythrorhizos Muhl. Annual; culm obtusely triangular (1-8 dm. high) ; umbel many-rayed ; invo- lucre 4-5-leaved, very long; involuoels bristle-form; spikelets very numerous, crowded in oblong or cylindrical nearly sessile heads, spreading horizontally, linear, flat- tish (.'J-IO mm. lonrj), bright chestnut-colored; scales lanceolate, mucronulate. (C Halei Britton, in part, not Torr.) — Allu- vial bank
. 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. 219, C. erythrorhizos. 220. C. ferax. 19. C. erythrorhizos Muhl. Annual; culm obtusely triangular (1-8 dm. high) ; umbel many-rayed ; invo- lucre 4-5-leaved, very long; involuoels bristle-form; spikelets very numerous, crowded in oblong or cylindrical nearly sessile heads, spreading horizontally, linear, flat- tish (.'J-IO mm. lonrj), bright chestnut-colored; scales lanceolate, mucronulate. (C Halei Britton, in part, not Torr.) — Allu- vial banks, Mass. to Ont, Minn., and southw. Fig. 219. — Dwarf tutted plants are sometimes sepa- rated as Var. ptMiLus Engelm. 20. C. fSrax Rich. Culm stout, mostly low ( dm. high) ; rays of the simple or compound umbel mostly all short and crowded ; spikelets 10-20-flowered, yellowish-brown or drab at maturity ( cm. long), the short joints of its axis winged with very broad scaly margins which embrace the ovoid-triangular achene; the firm scales ovate, obtusish, overlapping. (C speciosus Vahl.)'—Low grounds and sandy banks, Mass. to Fla., w. to Ont., Minn., and Tex. ; Cal. (Trop. re- gions.) Fig. 220. 21. C. Engelminni Steud. Similar; hut the spjfteZeis more sZeniJer and terete, somewhat remotely Si-lo-flowered, the zigzag joints of the axis slender and nar- rowly winged, and the oblong or oval broadly scarious scales proportionally shorter, so as to expose a part of the axis of each joint; achene oblong-linear, very small.— Low grounds, Mass. to Wise, and southw. Fig. 221. 22. C. strigbsus L. Peren- nial, with hard corm-like tubers ; culm m. high ; leaves flat, soft; most of the rays of the simple or com- pound umbel elongated, their sheaths 2-bristled ; spikelets several-flowered, cm. long, spreading, in loose heads; scales oblong- lanceolate, appressed, several-nerved, much longer than the linear-oblong achene. — Damp or fertile soil, Me. to Ont.,
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