. 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. 52 EQ0ISBTACEAE (HORSETAIL FAMILY) I. EUEQUISilTUM Sadebeck. Stems annual, mostly with regular verticils of branches; spikes not apiculate; stomata^ in one or two broad bands in each groove, their surfaces overlaid with a silex plate that bears a vertical slit in the center. i/ 1. E. arvfinse T. E. arvense. Crose- Bection of stem x 12. in threes ; centrum J eter.—Alluvial soil, N. S. and Que. to Alaska, southw. to w. Mass., N. J., and la., c
. 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. 52 EQ0ISBTACEAE (HORSETAIL FAMILY) I. EUEQUISilTUM Sadebeck. Stems annual, mostly with regular verticils of branches; spikes not apiculate; stomata^ in one or two broad bands in each groove, their surfaces overlaid with a silex plate that bears a vertical slit in the center. i/ 1. E. arvfinse T. E. arvense. Crose- Bection of stem x 12. in threes ; centrum J eter.—Alluvial soil, N. S. and Que. to Alaska, southw. to w. Mass., N. J., and la., chiefly in calcareous re- gions. April, May. (Eurasia.) Figs. 8,9. 3. E. sylviticum L. Stems dm. high; both kinds developing com- pound branches; centrum half the diameter ; ridges 8-14, flat, with a row of recurved spinules on each side; sheaths green, with the papery brown teeth coherent; primary branches 4-5-angled, the secondary 3-ang1ed. - (Common H.) Fertile stems dm. high, with loose 8-12-toothed sheaths, not rarely developing a few branches in wet places; sterile stems prostrate or erect, dm. high, 10-14-furrowed, variously branched; silex in punctiform dots; branches 3-4-angled, mostly simple, solid, winged, the teeth of their sheaths triangu- lar-lanceolate, with sharp erect acuminate points; root- stocks tuberiferous, felted; centrum ^-| the total diameter of the stem. — Common. (Widely distr.) Fig. 7. 2. E. prat^nse Ehrh. Sterile and finally fertile stems developing simple horizontal triangular branches whose first in tern odes do not exceed the stem-sheaths; teeth of branch-sheaths deltoid, acute; stems 2-3 dm. high, 8-20-ridged,.beset with flat spines of silex, arranged the total diam-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gray, Asa, 1810-1888; Robinson, Benj
Size: 1586px × 1576px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisher, booksubjectbotany
