Jepson Flora Project: Jepson Interchange    

 
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Jepson Interchange (more information)
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  • Up-to-date information about California vascular plants is available from the Jepson eFlora.

HYDROCHARITACEAE

WATERWEED FAMILY

Robert F. Thorne

Annual, perennial herb, aquatic, freshwater or marine, bisexual, monoecious, or dioecious
Leaves basal or cauline, alternate, opposite, or whorled, generally ± sheathing at base, glabrous
Inflorescence: cyme; flowers 1–few, subtended by ± sheathing, entire or lobed bract; staminate flowers sometimes deciduous, free-floating
Flower radial; perianth tube 0 or much elongated, peduncle-like in flower; sepals (0)3, green; petals (0)3, colored or white; stamens (1)3–many, generally in 1+ series; ovary inferior, chamber 1, placentas parietal or basal, ovules 1–many; style lobes generally 3, linear, lobed or notched
Fruit: achene or berry-like and dehiscing irregularly, linear to spheric, submersed
Genera in family: ± 17 genera, ± 130 species: worldwide; some cultivated for aquaria, others noxious weeds.

OTTELIA

Perennial, submersed to emergent, rooted in mud
Stems generally short, erect
Leaves generally ± basal, petioled; submersed blades generally strap-like, floating or emergent ones wide
Inflorescence terminal; flower solitary, persistent
Flower bisexual, fragrant; sepals 3; petals 3; stamens 3, staminodes 6+; ovary oblong, stigmas 6–9, linear, notched
Fruit oblong, irregularly dehiscent, generally ribbed
Seeds several
Species in genus: ± 40 species: tropical, warm temp Eurasia
Etymology: (Ancient name from Malabar, India)

Introduced

O. alismoides (L.) Pers.


Leaves 10–25 cm; lower blades elliptic to ovate, upper blades cordate to reniform; veins parallel, curved
Flower: sepals ± 1.5 cm, 4 mm wide; petals 2–3 cm, obovate, white to pinkish; anthers bright yellow
Fruit < 4 cm, oblong; ribs 2–10, scarcely winged; tip beaked
Ecology: Ditches, rice-fields
Elevation: ± 50 m.
Bioregional distribution: Formerly e Sacramento Valley (Butte Co.), presumed extirpated
Distribution outside California: native to Africa, India, sw Pacific
Potentially noxious weed.

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bioregional map for OTTELIA%20alismoides being generated
 


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