Hydrilla

Richard

Memoires de la Classe des Sciences Mathematiques et Physiques de L'Institut National de France 12(2): 9, 61, 73, plate 2a–k. 1814.

Etymology: Greek hydr-, water, and -illa, diminutive
Treatment appears in FNA Volume 22.
Revision as of 20:29, 5 November 2020 by imported>Volume Importer
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Plants perennial, of fresh or brackish waters. Rhizomes present, stolons absent. Erect stems rooted in substrate, branched or unbranched, elongate. Leaves cauline, whorled, 3–8 per node, submersed, sessile; blade linear, rarely slightly elliptic, base tapering to stem, apex acute; midvein without lacunae along side(s), blade uniform in color throughout; abaxial surface ly with prickles along midvein, without aerenchyma; intravaginal squamules fringed with orange-brown hairs. Inflorescences 1-flowered, sessile to subsessile; spathe not winged. Flowers unisexual, staminate and pistillate on different plants or on same plants, submersed, sessile; petals whitish to reddish. Staminate flowers: filaments distinct, released under water, rising to surface; anthers oval; pollen in monads; . pPistillate flowers: ovary 1-locular; floral tube long, styles 1, not 2-fid. Fruits linear, cylindric, smooth or with simple spiny processes, indehiscent. Seeds cylindric, glabrous.

Distribution

Introduced; North America, Central America, South America, Eurasia, Africa, Australia.

Discussion

Species 1.

... more about "Hydrilla"
Robert R. Haynes +
Richard +
North America +, Central America +, South America +, Eurasia +, Africa +  and Australia. +
Greek hydr-, water, and -illa, diminutive +
Memoires de la Classe des Sciences Mathematiques et Physiques de L'Institut National de France +
allen1976a +, austin1978a +, blackburn1970a +, cook1982a +, lakshmanan1951a +, shireman1981a +  and tarver1978a +
Hydrilla +
Hydrocharitaceae +