Disakisperma
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Name
Disakisperma Steud., Syn. Pl. Glumac. 1: 287. 1854. – Wikispecies link – IPNI link – Pensoft Profile
Type species
Disakisperma mexicana Steud. = Disakisperma dubium (Kunth) P.M. Peterson & N. Snow.
Description
Plants perennial, rarely annual in a few populations, occasionally stoloniferous. Culms 30–200 cm long, solid, decumbent or clambering to erect; nodes glabrous. Leaf sheaths half as long to slightly longer than internodes, glabrous or ciliate apically along margins; ligule membranous, 0.5–1.5 mm long, ciliate or fimbriate apically; leaf blades cauline, linear. Inflorescence apical and exserted at maturity or cleistogamous in lower leaf sheaths, a panicle composed of several to numerous unilateral racemes, racemosely or subdigitately scattered along a central axis; branches at maturity slightly reflexed to ascending or steeply erect. Spikelets sessile to subsessile, dorsally rounded to flattened, typically overlapping, disarticulation above the glumes; florets 4−13; glumes 2, 1-nerved or occasionally with remnants of two additional nerves near base, mucronate or emucronate; lemmas 3-nerved, rarely with remnants of two additional nerves near base, sometimes cartilaginous towards the base, macrohairs acute, obtuse, or clavicorniculate; paleas often somewhat cartilaginous towards base. Stamens 3. Lodicules 2, flabellate. Caryopses dorsally flattened, broadly concave on the hilar surface; pericarp weakly adnate to endosperm. 2n = 40, 60, 80 (Snow 1997[1]).
Vernacular name
In light of its only recent resurrection from generic synonymy (Peterson et al. 2012[2]), no common name exists for Disakisperma. We suggest Jacobsgrass to honor the memory of Dr. Surrey W. L. Jacobs (1946−2009), an Australian friend, colleague, and chloridoid specialist (e.g., Jacobs 1988[3]).
Key to the species of Disakisperma
Taxon Treatment
- Snow, N; Peterson, P; Romaschenko, K; 2013: Systematics of Disakisperma (Poaceae, Chloridoideae, Chlorideae) PhytoKeys, 26: 21-70. doi
Other References
- ↑ Snow N (1997) Phylogeny and systematics of Leptochloa P. Beauv. sensu lato (Poaceae, Chloridoideae, Eragrostideae). Ph.D. Dissertation, Washington University, St. Louis, Missouri.
- ↑ Peterson P, Romaschenko K, Snow N, Johnson G (2012) A molecular phylogeny and classification of Leptochloa (Poaceae: Chloridoideae: Chlorideae) sensu lato and related genera. Annals of Botany 109: 1319-1327. doi: 10.1093/aob/mcs077
- ↑ Jacobs S (1988) Systematics of the chloridoid grasses. In: Soderstrom T Hilu K Campbell C Barkworth M (Eds) Grass Systematics and Evolution. Smithsonian Institution Press, Washington, D.C., 277-286.
