, occasionally stoloniferous
. Leaf blades
or linear-lanceolate; ligule membranous. Inflorescence of digitately arranged racemes
, sometimes on a short axis or with secondary branchlets
, very rarely paniculate
usually in groups of 2-3(-4), imbricate to effuse, the latter often on notably long and unequal pedicels. Spikelets puberulous
, typically in stripes
between the well-defined veins, rarely glabrous
; lower glume
absent or reduced to a little scale up to 1/4 spikelet length; upper glume variable; lower lemma usually ± equal to spikelet; upper floret pallid
to black, apex subacute
to acuminate, rarely apiculate
. x = 9.
About 250 species:tropical and warm-temperate regions of the world; 22 species (three endemic) in China.
Digitaria has been traditionally divided on the nature of the spikelet hairs, which may be clavate , capitate, verrucose (warty, appearing beaded), or with crooked tips . As good magnification is required to see these features, the grouping of the spikelets on the raceme is a more practical aid to identification. Many species have regularly paired spikelets, which present no difficulty. In those species where the spikelets are grouped in clusters of 3 or more, care must be taken, as often the longest pedicel of a group is partially fused to the rachis so that the spikelets appear alternately paired and single, or sometimes one spikelet may be vestigial, or the spikelets may be paired toward the raceme tips.
Many species are very variable in spikelet pubescence and lemma nervation, even within a single raceme. Additionally, there are a number of complexes of intergrading species, so intermediates may occasionally be encountered. This has led to the publication of many superfluous names .
- Whittaker & Margulis,1978
- Haeckel, 1866
- Cavalier-Smith, 1981
- Sinnott, 1935 ex Cavalier-Smith, 1998
- Vascular Plants
- (Auct.) Cavalier-Smith, 1998
- Brongniart, 1843
- Takhtajan, 1967
- Takhtajan, 1967
- Small, 1903
- Family: Gramineae () - A.L. de Jussieu, 1789, nom. cons., nom. alt.
- Order: Poales () - Small, 1903
- Superorder: Juncanae () - Takhtajan, 1967
- Subclass: Commelinidae () - Takhtajan, 1967
- Class: Spermatopsida () - Brongniart, 1843
- Infraphylum: Angiospermae () - Auct.
- Subphylum: Euphyllophytina () - (Auct.) Cavalier-Smith, 1998
- Phylum: Tracheophyta () - Sinnott, 1935 ex Cavalier-Smith, 1998 - Vascular Plants
- Subkingdom: Viridaeplantae () - Cavalier-Smith, 1981
- Kingdom: Plantae () - Haeckel, 1866 - Plants
Members of the genus Digitaria
ZipcodeZoo has pages for 53 species, subspecies, varieties, forms, and cultivars in this genus:
D. abyssinica (African Couchgrass) · D. arenicola (Fall Witchgrass) · D. argillacea (Tropical Crabgrass) · D. bicornis (Asia Crabgrass) · D. californica (Arizona Cottontop) · D. ciliaris (Fingergrass) · D. cognata (Carolina Cottontop) · D. cognata var. cognata (Carolina Crabgrass) · D. cognata var. pubiflora (Carolina Crabgrass) · D. cruciata (Crabgrass) · D. diagonalis (Brown-Seeded Finger Grass) · D. didactyla (Crabgrass) · D. dolichophylla (Caribbean Crabgrass) · D. eggersii (Eggers' Crabgrass) · D. eriantha (Pangola Grass) · D. eriantha subsp. eriantha (Crabgrass) · D. eriantha subsp. pentzii (Woolly Fingergrass) · D. exilis (Fonio) · D. filiformis (Slender Crabgrass) · D. floridana (Florida Crabgrass) · D. fuscescens (Yellow Crabgrass) · D. gracillima (Long-Leaf Crabgrass) · D. henryi (Henry´s Crabgrass) · D. hitchcockii (Short-Leaf Crabgrass) · D. horizontalis (Jamaica Crabgrass) · D. iburua (Black Fonio) · D. insularis (Sourgrass) · D. ischaemum (Small Crabgrass) · D. ischaemum var. ischaemum (Small Crabgrass) · D. longiflora (India Crabgrass) · D. milanjiana (Madagascar Crabgrass) · D. natalensis (Natal Crabgrass) · D. nuda (Naked Crabgrass) · D. panicea (Millet Crabgrass) · D. patens (Texas Cottontop) · D. pauciflora (Florida Pineland Crabgrass) · D. pubiflora (Carolina Crabgrass) · D. radicosa (Trailing Crabgrass) · D. sanguinalis (Crabgrass) · D. seriata (Crabgrass) · D. serotina (Blanket Crabgrass) · D. setigera (East Indian Crabgrass) · D. setivalva (Crabgrass) · D. similis (Roadside Crabgrass) · D. simpsonii (Isle-Of-Pines Crabgrass) · D. swalleniana (Swallen's Crabgrass) · D. ternata (Black-Seeded Crabgrass) · D. texana (Texas Crabgrass) · D. tomentosa (Woolly Crabgrass) · D. umfolozi (Crabgrass) · D. velutina (Annual Couchgrass) · D. villosa (Shaggy Crabgrass) · D. violascens (Violet Crabgrass)
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- Bulletin of the Torrey Botanical Club. 25 1898 New York: Torrey Botanical Club, 1870-1996 url p. 303.
- Contributions from the United States National Herbarium 46 2003 Washington, D.C.: Smithsonian Institution Press, 1890- url p. 195, p. 196, p. 210, p. 611.
- Flora of Kwangtung and Hongkong (China) being an account of the floweriing plants, ferns and fern allies together with keys for their determination preceded by a map and introduction, London, H. M. Stationery off., printed by Darling and son, ltd., 1912. url .
- General index to the flora of Formosa as recorded in all literature up to the publication of Icones plantarum Formosanarum VI = Taiwan shokubutsu somokuroku / [B. Hayata] [Taihoku]: Taiwan Sotokufu Minseibu Shokusankyoku, 1917. url p. 95.
- Icones plantarum formosanarum nec non et contributiones ad floram formosanam: or, Icones of the plants of Formosa, and materials for a flora of the island, based on a study of the collections of the Botanical survey of the Government of Formosa / By B. Hayata. .. Taihoku: Bureau of Productive Industry, Government of Formosa, 1911-1921. url p. 65.
- Manual of the grasses of the United States / by A.S. Hitchcock. Washington: U.S. G.P.O., 1935. url p. 555.
- Materials for a flora of the Malayan peninsula, by H. N. Ridley. Singapore: Printed at the Methodist publishing house, 1907. url p. 57.
- The Journal of the College of Science, Imperial University of Tokyo, Japan = Tokyo Teikoku Daigaku kiyo. Rika. Tokyo, Japan: The University, 1898-1925. url p. 507.
- The flora of British India /By J. D. Hooker assisted by various botanists. Published under the authority of the secretary of state for India in council. 7 1897 London: L. Reeve, 1875-97. url p. 16, p. 16.
- The flora of British India. London, L. Reeve & Co., 1875-97. url .
- Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed January 10, 2012.
- Biodiversity Heritage Library NamebankID: 10752313
- Global Biodiversity Information Facility Taxonkey: 15753873
- Globally Unique Identifier: urn:lsid:ipni.org:names:398666-1
- Zipcode Zoo Species Identifier: 2412853