Higher Taxonomy
Common Name: WATERWEED FAMILY
Habit: Annual, perennial herb, aquatic, freshwater or marine, glabrous or hairy; monoecious, dioecious, or flowers bisexual. Leaf: basal, alternate, opposite, or whorled, generally sessile, generally +- sheathing at base. Inflorescence: axillary, terminal, or scapose, cyme or flowers 1, subtended by +- sheathing, entire or lobed bract; staminate flowers sometimes deciduous, free-floating. Flower: generally radial; perianth 0 or tube 0 or elongate, peduncle-like in flower; sepals (0)3(4), green; petals (0)3(4), white or not; stamens (0)2--many, generally in 1+ series; ovary inferior, chamber 1 or falsely 6--9, placentas parietal, 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. Note: Ottelia alismoides (L.) Pers. is a possibly extirpated alien.
eFlora Treatment Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes
Scientific Editor: Thomas J. Rosatti.
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Limnobium
Habit: Perennial herb, floating in dense mats, rooted in mud when stranded; monoecious. Stem: stolons floating or suspended in water. Leaf: basal, emergent or floating, petioled; floating with swollen spongy cells abaxially. Inflorescence: cyme, peduncle 0 or short. Flower: unisexual, emergent, pedicelled; petals green-white to yellow. Staminate Flower: filaments fused at least 1/2, anthers elongate. Pistillate Flower: ovary chambers 1, styles 3--9, 2-lobed +- to base. Fruit: fleshy berry, ellipsoid to spheric, smooth to ridged, dehiscing irregularly. Seed: ellipsoid, spiny. Species In Genus: 2 species: America. Etymology: (Greek: living in pools) Jepson eFlora Author: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)
Previous taxon: Hydrilla verticillataNext taxon: Limnobium spongia
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Citation for this treatment: Robert F. Thorne, C. Barre Hellquist & Robert R. Haynes 2012, Limnobium, in Jepson Flora Project (eds.) Jepson eFlora, https://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=9640, accessed on January 27, 2021.
Citation for the whole project: Jepson Flora Project (eds.) 2021, Jepson eFlora, https://ucjeps.berkeley.edu/eflora/, accessed on January 27, 2021.
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