Najas testui Rendle

Species

Angiosperms > Alismatales > Hydrocharitaceae > Najas

Characteristics

Stems unarmed, ± 0.5 mm. in diameter, often plumose above because of the closely packed leaves.. Leaves (6.5-)11.8-32 mm. long, flat, acute, linear-lanceolate (0.26-)0.42-0.72(-1.1) mm. wide including teeth on both sides, (0.24-0.53(-0.87) mm. wide excluding teeth); margin on each side minutely serrulate with inconspicuous spiny teeth, mainly consisting of the brownish spine-cell or serrulate with 7-30 conspicuous spiny teeth on broad triangular excrescences; teeth (0.05-)0.09-0.14 mm. long, the ratio of teeth-length to leaf-width being 0.13-0.3(-0.5); midrib without spiny teeth; septa absent or clearly visible; fibres absent or present on margin and/or near midrib; sheath (1.3-)1.9-2.4(-2.9), (including auricle and spine-cells) × (1.37-)2.6(-3.22) mm. (ratio = 0.8-1.6), truncate to auriculate, the auricle 0.24-0.96 mm. long (including spine-cells) and 0.2-1 mm. wide (ratio = 0.75-1.74), serrulate or lacerate with 2-8 spine-cells on each side; apex of the auricle rather obtuse.. Male and ♀ flowers generally on different branches, solitary or several together, each at the very base of a (sometimes very short) axillary shoot.. Male flower (1.2-)1.9-2.5 (including spathe-neck) × 0.4-1 mm., the neck of the spathe ± 0.6 mm., tapering at the top, bearing brownish spine-cells on the apex; inner envelope protruding 0.16-0.32 mm. above the anther; anther 1-2.4 × 0.36-1 mm., tetrasporangiate.. Female flower enclosed in a spathe, (1.1-)1.5-3 (including spathe-neck) × 0.4-0.6 mm., the neck of the spathe about halfway along the style, bearing no brownish spine-cells on the apex; ovary 0.5-1(-1.77) × (0.3-)0.6 mm.; style and stigma 0.8-1.3 mm.; stigma 2-lobed.. Fruit with persistent membranous pericarp and remnants of style and spathe.. Seed elliptic-oblong to ovate, (1.85-)2-2.3(-2.6) × (0.4-)0.56-0.79 mm. (ratio = (2.3-)3.1-3.8); areoles 0.11-0.23 mm. long, irregularly arranged in longitudinal rows of 10-14(-23); cell-walls raised.
Life form annual
Growth form herb
Growth support -
Foliage retention -
Sexuality monoecy
Pollination -
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Environment

Light -
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Hardiness (USDA) 9-12

Usage

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

Cultivation

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Distribution

Najas testui world distribution map, present in Angola, Central African Republic, Ghana, Kenya, Nigeria, Rwanda, Sudan, Sierra Leone, Chad, Tanzania, United Republic of, Uganda, and Zambia

Conservation status

Najas testui threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:603073-1
WFO ID wfo-0000769588
COL ID 45L3B
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Najas meiklei Najas testui