WorldFloraDB - Posidoniaceae

Characteristics

Marine or occasionally estuarine, submerged, robust, perennial herbs. Rhizome herbaceous, monopodially branched, creeping, with a scale and branched roots at each node. Leaves distichous, alternate, with distinct blade and sheathing base. Leaf sheath amplexicaul, ligulate, auriculate. Leaf blade linear, glabrous, longitudinally veined; stomata absent; tannin cells numerous. Squamules (small scales within sheathing base of leaf) numerous. Inflorescence racemose with several spike-like units, pedunculate. Flowers hermaphrodite; perianth absent; stamens 3, sessile; anthers 2, bilocular, longitudinally dehiscent; pollen filiform; carpel 1; ovule 1; stigma sessile, ornate. Fruit a drupe with spongy pericarp, dehiscent. Seed with an enlarged nutrient-storing hypocotyl and an embryo with well-developed polyphyllous plumule; testa membranous.

More

Herbs perennial, submerged, marine, with creeping rhizome and short, erect stems. Rhizomes and stems with dense, persistent, fibrous leaf bases. Leaves basal, alternate, sheathed at base; sheaths convolute, auriculate at base, apex ligulate. Inflorescence of 1 or more aggregated spikes on elongated peduncle, subtended by reduced leaves (leaflike bracts). Flowers bisexual or uppermost with a reduced gynoecium. Perianth absent or of 3 caducous scales. Stamens 3; anthers sessile, extrorse, with a thick connective, opening by longitudinal slits. Carpel 1; ovule 1, elongated. Fruit fleshy, indehiscent. Seeds without endosperm; embryo straight.

Life form	perennial
Growth form	herb
Growth support	-
Foliage retention	-
Sexuality	hermaphrodite
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Mature height (meter)	-
Root system	creeping-root rhizome
Rooting depth (meter)	-
Root diameter (meter)	-
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Nitrogen fixer	-
Photosynthetic pathway	-

Environment

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Hardiness (USDA)	-

Usage

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

Cultivation

Mode	-
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Optimum temperature (C°)	-
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Images

Distribution

Identifiers

LSID	urn:lsid:ipni.org:names:77126759-1
WFO ID	wfo-7000000494
COL ID	627NP
BDTFX ID	101105
INPN ID	597683
Wikipedia (EN)
Wikipedia (FR)	Link

Synonyms

Posidoniaceae

Lower taxons

Posidonia

WorldFloraDB 2024

Posidoniaceae Vines

Family

Angiosperms > Alismatales