Text-Book of Western Botany; Consisting of Coulter's Manual of the Botany of the Rocky Mountains, to Which Is Prefixed Gray's Lessons in Botany. for T

Text-Book of Western Botany; Consisting of Coulter's Manual of the Botany of the Rocky Mountains, to Which Is Prefixed Gray's Lessons in Botany. for T

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 edition. Excerpt: ...and margined or thin-edged, or if turgid some of them winged: pappus not caducous. 40. Hellanthella. Rays neutral, rarely wanting. Pappus of delicate scales between the two chaffy teeth or awns which surmount the two acute margins of the akenc, or these obsolete in age. Ovary often wing-margined, but mature akene not so. 41. Verbeaina. Involucre campanulate or hemispherical, imbricated. Rays fertile, sometimes neutral or none. Akenes usually winged and flat, 2-awned, or in the ray 1 to 3-awned, with no intermediate scales, and even the awns sometimes wanting. Leaves apt to 1- d(c)current as wings on the stem. Akenes obcompresscd or sometimes terete, and the subtending chaffy bracts flat or hardly concave; otherwise as in the last section: heads many-flowered: leaves mostly opposite: style-tips of the disk-flowers produced into a cusp or cone: involucre double: receptacle flat or merely convex: rays in ours neutral. --Akenes never with retrorsely bar1ed awns. 42. Coreopsis Involucre of two distinct scries of bracts, all commonly united at the very base; outer foliaceous, narrower, and usually spreading; inner erect or incurved after blooming, each scries commonly 8 in number. Rays about 8-Akenes flat, or-bicular to linear-oblong, winged or wingless, truncate orcmarginate at snmuiit, 1earing 2, rarely 3 or 4 naked awns, scales, or teeth, or sometimes destitute of pappus.-Awns of the pappus when present retrorsely barlwd or hispid, 43. Bldens. Bracts of the involucre distinct, or united only at the common base. Akenes neither winged nor beaked, 2 to 5-awned: the awns retrorsely hispid. Rays neutral yellow or white, sometimes wanting. 44. Tht-hrspermnv Bracts of the inner involucre united into a cup; outer of shorter and narruw bracts,show more

Product details

  • Paperback | 318 pages
  • 189 x 246 x 17mm | 572g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236499727
  • 9781236499721