Plants photographed on Kyffhäuser
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Aristida effusa Henrard

Aristida effusa


Family: Poaceae
Full name: Aristida effusa Henrard
Location: Kyffhäuser (2416AD + 2416CB)
ID status: ID not 100% certain
Afrikaans common name(s): Pluimsteekgras
English common name(s): Spreading stick grass, Loose bristle grass
Synonym(s): Aristida waibeliana Henrard fide De Winter, Bothalia 8: 251 (1965).
Status: Native
Description: Tufted annual. Culms erect, branched, up to 0.8 m high. Leaf blade flat, hairless, up to 300 x 3 mm. Ligule a fringe of fine hairs. Leaf sheath keeled, hairless. Inflorescence a spreading, loose panicle, up to 300 mm long and 150 mm wide. Spikelets always in small groups at tips of lax lateral branches; column absent; awns 3; central awn up to 16 mm long; lateral awns 2-13 mm long. (from Grasses of Namibia)

HABIT Annual; caespitose. Culms erect; slender; 45–90 cm long. Culm-internodes distally glabrous. Culm-nodes glabrous. Lateral branches ample. Ligule a fringe of hairs. Leaf-blades flat; 15–30 cm long; 2–3 mm wide. INFLORESCENCE Inflorescence a panicle. Panicle open; ovate; effuse; 20–30 cm long; 15 cm wide; with spikelets clustered towards branch tips. Primary panicle branches spreading. Panicle branches flexuous. Spikelets solitary. Fertile spikelets pedicelled. FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 10–11.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; bearded; obtuse. GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate; 6–8.5 mm long; 0.66–1.1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume surface scabrous; rough above. Lower glume apex acute, or acuminate. Upper glume lanceolate; 5.5–8 mm long; 0.66 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein smooth. Upper glume lateral veins absent. Upper glume apex truncate, or obtuse. FLORETS Fertile lemma linear; subterete; 9–11.5 mm long; coriaceous; keeled; 3 -veined. Lemma surface scabrous; rough above. Lemma margins convolute; covering most of palea. Lemma apex acute; awned; 3 -awned. Principal lemma awn with 16 mm long limb; persistent. Lateral lemma awns 13 mm long; shorter than principal. Palea without keels. FLOWER Anthers 3. FRUIT Caryopsis with adherent pericarp; linear. (from website)
Link(s) African Plant Database
JSTOR Plant Science
Kew Herbarium Catalogue
BGBM Berlin-Dahlem - Virtual Herbarium
Züricher Herbarien
iNaturalist (Namibia / Alex Dreyer)
iNaturalist (Namibia)
iNaturalist (southern Africa)
Flora of Zimbabwe
Fleurs de notre Terre - Galerie Namibie
Tree Atlas of Namibia
Photographer: AA Dreyer
Date of photograph: 23 Jun 2010
Camera make: Canon
Camera model: PowerShot A700
Lens aperture: f/2.8
Shutter speed: 1/50 s
ISO speed: -
Content last updated: 18 Apr 2024

Note: The identification of some of the plants on this website is not 100% certain. Any comments will be highly appreciated. I would also be willing to supply higher resolution images upon request. Please contact me at the e-mail address given below.

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Last updated 18 Apr 2024

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