Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
©Copyright 1993 by the Regents of the University of California
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CYMODOCEACEAE

MANATEE-GRASS FAMILY

Robert F. Thorne

Perennial from long, slender, jointed rhizomes, dioecious, marine aquatic, glabrous
Stem erect, sometimes short
Leaves simple, cauline, alternate or opposite, 2-ranked; sheath open; ligule present; blade 0.5–15 mm wide, ± linear, ± flat or cylindric, margin entire
Inflorescence: flowers 1–2 (or bracted cyme), axillary
Flowers minute; perianth 0
Staminate flower: stamens 2, filaments 0 or short and ± fused; pollen filament-like, sticking together in string-like bodies < 1 mm wide
Pistillate flower: pistils 1–2, simple, ovary superior, chamber 1, ovule 1, style 1, lobes 0–3
Fruit: utricle
Seed 1
Genera in family: 5 genera, ± 13 species: tropical, subtropical worldwide.

HALODULE


Stems erect, several, short
Leaves alternate to ± opposite, narrowly linear; tip generally 3-toothed
Flowers 1 per node, ± enclosed by leaf sheaths
Staminate flower: anther sacs attached to filament at different places
Pistillate flower short-stalked; pistils 2, simple, attached to receptacle at slightly different places, ovary asymmetric, style 1, simple, thread-like, from side of ovary
Species in genus: 1–2 species: tropical, subtropical marine
Etymology: (Greek: perhaps from ancient name meaning under salty water)
Poorly known except to students of algae. Sometimes treated in Zannichelliaceae.

Introduced

H. wrightii (Asch.) Asch.

SHOAL-GRASS


Leaf generally 10–20 mm, 0.5–3 mm wide
Ecology: Aquatic
Elevation: -70 m.
Bioregional distribution: Sonoran Desert (Salton Sea, where presumed extirpated), expected in warm, coastal, marine habitats
Distribution outside California: native to coastal Mexico and Caribbean Sea

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bioregional map for HALODULE%20wrightii being generated
 
N.B. The distribution depicted here differs from that given in The Jepson Manual (1993)
YOU CAN HELP US make sure that our distributional information is correct and current. If you know that a plant occurs in a wild, reproducing state in a Jepson bioregion NOT highlighted on the map, please contact us with that information. Please realize that we cannot incorporate range extensions without access to a voucher specimen, which should (ultimately) be deposited in an herbarium. You can send the pressed, dried collection (with complete locality information indicated) to us (e-mail us for details) or refer us to an accessioned herbarium specimen. Non-occurrence of a plant in an indicated area is difficult to document, but we will especially value your input on those types of possible errors (see automatic conversion of distribution data to maps).

Retrieve Jepson Interchange Index to Plant Names entry for Halodule wrightii
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Overlay Consortium of California Herbaria specimen data by county on this map
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