File:The American journal of science, and c (1819) (14592208228).jpg

Identifier: americanjournalo11819newy (find matches)
Title: The American journal of science, & c
Year: 1818 (1810s)
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Subjects:
Publisher: New York : J. Eastburn and Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Specif c character of the asclepias lanceolata :—Stem de-cumbent, hirsute ; leaves opposite, lanceolate, acute,.sub ses-sile, hirsuit umbels lateral, solitary, sessile, nodding, subglo-bose, dense-flowered; appendage none. See the plate. The asclepias lanceolata is allied to the asclepias longifoliaand viridiflora by the absence of appendage or horn of thenectary. It is distinguished from the longifolia, which ischaracterized by alternate linear leaves, and umbels erect. The asclepias lanceolata and asclepias viridiflora belongto Mr. Elliotts genus acerates. In both, the nectary orstamineous crown is short concave, and oppressed to theangles of the filaments. Art. VIII. Description of a JVew Genus of AmericanGrass. Diplocea Barbata, by C. S. Rafinesque, Esq. X_yIPLOCEA. Generic definition. Flowers paniculated mo-noical or polygamous. Exterior glumes membranaceous bi-valve one to three flowered, valves subequal emarginatedmutic. Anterior glumes bivalve unequal, the largei^it notched,
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c/^Ai^i^ U//^ce/?ui/^ Diplocea Barbata, 253 notch aristated, the smallest rautic entire bearded. Additionalcharacters. Flowers when single sepile with a lateral juttingpeduncle, when double, one sepile and one pedunculated,when three two are pedunculated and alternate. The her-maphrodite and male flowers are similar : the female arenearly clandestine, inferior. Stamens 3, styles 2. Seedsovate oblong. Observations. This genus is intermediate between amphi-carpon, Raf. (Milium amphicarpon, Pursh) and aira, L. Itdiffers from this last by its polygamy, variable number offlowers, notched valves, &c. The generic name means doteblenotch. Its type is the following species, which had beenranged with the aira, by Walter, and considered doubtful byPursh. Diplocea Barbata. Specific definition. Stems cespitose, articulations bearded ;leaves rough glaucous, neck ciliated ; panicles, few flowered,female axillary ; largest valvet rinervate, and ciliated as wellas the awl. Latin definition. Caulib

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