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Digitaria longiflora

(India Crabgrass)

Overview

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Interesting Facts

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Common Names

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Click on the language to view common names.

Common Names in Chinese:

Chang Hua Ma Tang

Common Names in English:

India Crabgrass, Indian Crabgrass, Wire Crabgrass

Description

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Genus Digitaria

Annual or perennial . Culms erect or decumbent , occasionally stoloniferous . Leaf blades linear or linear-lanceolate; ligule membranous. Inflorescence of digitately arranged racemes , sometimes on a short axis or with secondary branchlets , very rarely paniculate ; spikelets usually in groups of 2-3(-4), imbricate to effuse, the latter often on notably long and unequal pedicels. Spikelets puberulous to villous , 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 .[1]

Physical Description

Species Digitaria longiflora

Annual or short-lived perennial , usually with slender, many-noded stolons. Culms ascending , leafy, 10-40 cm tall. Leaf sheaths pubescent or glabrous ; leaf blades broadly linear , 2-5 × 0.2-0.4 cm, glabrous or papillose-pilose at base , apex acute; ligule 1-1.5 mm. Inflorescence digitate; racemes 2-3, arching at maturity, 2-5 cm; spikelets ternate ; rachis ribbonlike, winged , 0.5-0.8 mm broad, midrib low and rounded ; pedicels terete , smooth , with discoid tips . Spikelets elliptic , 1.2-1.5 mm, apex acuminate, hairs verrucose ; lower glume absent; upper glume as long as spikelet, 5-veined, densely appressed-pubescent; lower lemma as long as spikelet, 7-veined, glabrous between middle and lateral veins, otherwise pubescent; upper lemma yellowish brown or pale gray, apex acuminate. Anthers 0.6-0.8 mm. Fl. and fr. Apr-Oct. 2n = 18. [source]

Digitaria fuscescens (J. Presl) Henrard differs from D. longiflora only by its glabrous spikelets and slightly longer , fractionally exserted upper floret. Most likely it is simply a glabrous variant of D. longiflora. It is widespread throughout the tropics, and although reported from S China, no specimens have been seen. [source]

Habit: Graminoid

Habitat

Field margins , grasslands, weedy places; 600-1100 m. [2].

Typically found at an altitude of 0 to 1,168 meters (0 to 3,832 feet).[3]

Biology

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Reproduction

Duration: Annual

Taxonomy

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Synonyms

Digitaria ischaemum var. mississippiensis (Gattinger) Fern. • Digitaria propinqua (R. Brown) P. Beauvois • Observ. Bot. 4: 15. 1786 • P. parvulum Trinius • P. propinquum R. Brown • Panicum ischaemum Schreb. • Panicum longi-florum (Retzius) J. F. Gmelin • Panicum longiflorum (Retz.) J. G. Gmel. • Paspalum longiflorum Retz. • Paspalum longiflorum Retzius • Syntherisma ischaemum (Schreb.) Nash • Syntherisma longiflora (Retzius) H. C. Skeels.

Notes

Name Status: Accepted Name .

Last scrutiny: 15-Mar-2000

Similar Species

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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)

More Info

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Further Reading

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Notes

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Contributors

Data Sources

Accessed through GBIF Data Portal December 01, 2007:

Identifiers

Footnotes

  1. Shou-liang Chen & Sylvia M. Phillips "Digitaria". in Flora of China Vol. 22 Page 1, 500, 539. Published by Science Press (Beijing) and Missouri Botanical Garden Press. Online at EFloras.org. [back]
  2. "Digitaria longiflora". in Flora of China Vol. 22 Page 541, 546, 547. Missouri Botanical Garden Press. Online at EFloras.org. [back]
  3. Mean = 125.960 meters (413.255 feet), Standard Deviation = 592.620 based on 141 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]
Last Revised: 7/15/2012