A text-book of grasses with especial reference to the economic species of the United States . 207. Spikelets not all alike, the sessile one of each pairfertile, the pedicelled sterile, sometimes reduced to thepedicel. The genera described below are included bysome authors as sub-genera of the large genus Andro-pogon. The axis of the raceme is articulated. Theawn is very large and strong in some genera (Hetero-pogon, Chrysopogon), is geniculate and twisted, andbears at the base of the spikelet a strong sharp hairy 168 A TEXT-BOOK OF GRASSES. Fig. 15. Erianthus divaricatus. Plant reduced; spikel
A text-book of grasses with especial reference to the economic species of the United States . 207. Spikelets not all alike, the sessile one of each pairfertile, the pedicelled sterile, sometimes reduced to thepedicel. The genera described below are included bysome authors as sub-genera of the large genus Andro-pogon. The axis of the raceme is articulated. Theawn is very large and strong in some genera (Hetero-pogon, Chrysopogon), is geniculate and twisted, andbears at the base of the spikelet a strong sharp hairy 168 A TEXT-BOOK OF GRASSES. Fig. 15. Erianthus divaricatus. Plant reduced; spikelet, the two glumes, andthe fertile lemma with lower portion of awn, X3; flower, X5. ANDROPOGONEjE 169 callus, the whole much resembling the awned fruit ofStiya spartea. 208. Andropogon L.—Sessile spike-lets all alike in more or less elongatedracemes. The racemes may be single orin pairs, or rarely 3 or 4 from a sheath-ing bract, or they may be in nakedpanicles. The species are usually coarseperennials that inhabit prairies, hills,pine-barrens and other dry places. Somespecies are important native foragegrasses. Two of these are common onthe prairies of the Mississippi Valley,the little bluestem (A. scoparius Michx.)and the big bluestem {A. fmeatus Muhl.)(Fig. 16). The first species has solitaryracemes from each bract or spathe, andis a representative of the subgenusSchizachyrium. The other has 3 or 4racemes in a naked digitate cluster. Acommon but less valuable species, thebroom-sedge {A. virginicus L.), is foundin the Atlantic st
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Keywords: ., bookauthorhi, bookcentury1900, bookdecade1910, booksubjectgrasses
