Gahnia tristis Nees

Species

Angiosperms > Poales > Cyperaceae > Gahnia

Characteristics

Stems smooth, 50-100 cm by 2-5 mm. Leaves overtopping the stem, with involute scabrous margins; sheaths long, brown. Inflorescence spike-like, rigid, narrow, oblong, 15-45 cm by 3-7 cm, dense at the top, more or less interrupted at the base, consisting of 10-20 fascicles of short to rather long (1½-3 cm, rarely up to 8 cm long) secondary panicles; primary branches 1-3 together, short, rigid, included by the sheath. Lower bracts as long as or somewhat over-topping the inflorescence, dilated at the base; sheaths pale brown. Spikelets numerous, densely crowded, shortly peduncled, oblong-lanceolate, fi-nally almost turbinate, 7-10 mm long, 1-flowered. Glumes 6-8, the lower 4-6 empty, ovate-lanceolate, ferrugineous to brown, long-acuminate, the upper 2-3 much shorter, broadly ovate, rounded at the apex, ciliolate. Stamens 3-4(-6?); filaments accrescent, finally up to 2 cm long, smooth, included by the inrolled apices of the upper sterile glumes; anthers 3-4 mm long; appendage of the connective subulate, ½-¾ mm. Nut ellipsoid, trigonous, acute, smooth, finally blackish brown to black, 4½ by 1¾-2(-2½) mm. Endocarp not grooved. Fixing-mechanism.
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Roots stout, rigid. Rhizomes short, woody. Culms 0.5-1.5 m tall, robust, hollow, noded. Leaves basal and cauline; sheath brown to reddish brown, 10-20 cm; leaf blade 0.4-1.8 m × 0.7-1.2 cm, papery to leathery, margin scabrous, apex acuminate. Inflorescence a contracted panicle, spikelike, 14-40 × 2-3 cm, bearing 7-20 fascicles of partial panicles; partial panicles ovoid to ellipsoid, 2-5 cm; peduncles short, rigid, enclosed by inflorescence bract sheath. Spikelets numerous, densely congested, fusiform, 8-10 mm, 1-flowered. Glumes 8-10, initially yellowish brown but maturing to dark brown; basal 4-6 glumes ovate-lanceolate, papery, rigid, 1-veined, apex acuminate; apical 2 or 3 glumes broadly ovate, much shorter, margin apically ciliolate, apex emarginate to rounded; apicalmost glume bearing a bisexual flower. Perianth bristles absent. Stamens 3. Stigmas 3. Nutlet pale brown when young but maturing black, obovoid-oblong, 4-4.5 × 1.7-2 mm, 3-sided, smooth, shiny. Fl. and fr. Mar-Dec.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.5 - 1.25
Root system rhizome
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months -
Fruit color -
Fruiting months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Nitrogen fixer -
Photosynthetic pathway -

Environment

In dry spots near the sea, on riverbanks, also in rocky places and along trails in the mountains, up to 1200 m in the Malay Peninsula, up to 2000 m in Borneo.
Light -
Soil humidity 1-3
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-12

Usage

Uses medicinal
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Gahnia tristis unspecified picture

Distribution

Gahnia tristis world distribution map, present in China, Indonesia, Iceland, Sri Lanka, Malaysia, Singapore, Thailand, Taiwan, Province of China, and Viet Nam

Identifiers

LSID urn:lsid:ipni.org:names:308649-1
WFO ID wfo-0000427375
COL ID 6JVZZ
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Gahnia tristis Mariscus wichurae Mariscus tristis Gahnia boniana Gahnia stricta Gahnia wichurai