. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 19, No. 2 of the Genus Chloris (Gramineae) 63 characters (especially various pubescence on the lemma, such as presence or absence of hairs on the keels, midnerves, and margins). In addi- tion, the lemmas themselves ma\ be variously gibbous, keeled, or merely folded at the mid- nerve. Only two attributes seem constantly cor- related: (1) the conspicuous tuft ot spreading hairs on the upper lemma margins and (2) the appressed to erect or only slightly divergent spikes. No well-marked patterns o
. Brigham Young University science bulletin. Biology -- Periodicals. Biological Series, Vol. 19, No. 2 of the Genus Chloris (Gramineae) 63 characters (especially various pubescence on the lemma, such as presence or absence of hairs on the keels, midnerves, and margins). In addi- tion, the lemmas themselves ma\ be variously gibbous, keeled, or merely folded at the mid- nerve. Only two attributes seem constantly cor- related: (1) the conspicuous tuft ot spreading hairs on the upper lemma margins and (2) the appressed to erect or only slightly divergent spikes. No well-marked patterns of variation can be identified, though several somewhat cr)'ptic populations are noticeable. Most specimens from Australia and some from Asia and Africa have relativel)' narrow lemmas that are not con- spicuously gibbous, though other collections from the same general area may show the typical prominently gibbous keel. Some of the populations, especially those from Tibet and Nepal, ma\' eventually prove to be distinct; but presently, so few specimens are available for study that it seems advisable to treat the entire variable population as a single specie's. By con- trast, western hemisphere material seems to be quite uniformly gibbous, usualh' conspicuously so. Occasionalh' novelties, such as a specimen collected by Dr. T. L. Bancroft at Falm Island, Queensland (K!), may be very different. This particular specimen was unique in having dense- ly pilose glumes. In other respects it is similar to typical specimens of C. virgata and is consid- ered here as merely an aberrant individual. Chloris virgata closely resembles C. gaijana and C. pilosa in spikelet characters. It may be easil)- separated from the former in being an annual and from the latter in having relatively long awns. CIdorif; virgata lias Ijcen widel\- collected from many habitats, primarily in warm temper- ate to tropical areas, but extending well into temperate areas where hot summers are com- mon (Fig. 36). Over 1,
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