Najas horrida A.Braun ex Magnus

Species

Angiosperms > Alismatales > Hydrocharitaceae > Najas

Characteristics

Stems unarmed, up to 100 cm. long, 0.4-2 mm. in diameter, often bushy above because of the curved leaves.. Leaves 3.2-20(-29) mm. long, flat, bulky or fleshy, acute, linear-lanceolate, 0.56-2.40(-3.22) mm. wide including teeth on both sides (0.16-)0.24-1(-1.6) mm. wide excluding teeth; margin on each side serrulated with (2-)5-12(-16) conspicuous spiny teeth on broad to very broad triangular excrescences; teeth 0.15-1.38 mm. long, the ratio of teeth-length to leaf-width being (0.35-)0.55-1.57(-3.08); midrib without spines; septa clearly visible; fibres absent; sheath rounded or sloping, (1.21-)1.5-2.3(-3.87) mm. (including spine-cells) × (1.1-)1.46-2.68(-5.8) mm. (ratio = 0.5-1.4), serrulate or lacerate with 1-15 spine-cells on each side.. Male and ♀ flowers solitary, generally on different branches (? different plants).. Male flower 1.3-2.9(-3.5) (including spathe-neck) × 0.32-1.2 mm.; the neck of the spathe 0.32-0.72 mm., tapering at the top, bearing brownish spine-cells on the apex; inner envelope protruding 0.16-0.4 mm. above the anther; anther 0.88-2.3 × 0.55-1.2 mm., tetrasporangiate.. Female flower naked, (1.3-)2-3(-4.2) mm. long; ovary 0.5-2.4 × 0.2-0.9 mm.; style and stigma 0.64-1.77 mm.; stigma 2-3-lobed.. Fruit with persistent membranous pericarp and style-remnants.. Seed elliptic-oblong, 1.6-3.2 × 0.48-0.84 mm. (ratio = 3.2-4.2); areoles squarish, rectangular or seldom hexagonal, 0.05-0.1 mm. long, regularly arranged in longitudinal rows of (18-)25-35(-40).
Life form annual
Growth form herb
Growth support -
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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 horrida world distribution map, present in Burkina Faso, Botswana, Central African Republic, Cabo Verde, Algeria, Egypt, Eritrea, Ethiopia, Ghana, Kenya, Madagascar, Mali, Mozambique, Namibia, Nigeria, Sudan, Senegal, Singapore, Sierra Leone, Chad, Togo, Tanzania, United Republic of, Uganda, Zambia, and Zimbabwe

Conservation status

Najas horrida threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:603018-1
WFO ID wfo-0000769510
COL ID 45KZK
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Najas horrida Najas interrupta