Ruppia maritima |
Ruppiaceae |
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beaked ditch-grass, widgeon-grass |
ditch-grass family |
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Stems | widely branched, 50 cm × 0.1–0.7 mm long; terete; lower stems rhizomatous; upper stems erect and leafy. |
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Leaves | submersed, 3–10.5 cm × 1 mm; apex more or less obtuse; stipules adnate to the petiole, 5–15 mm long; the free ends 1–5 mm long. |
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Inflorescences | terminal; head-like spikes; flowers less than 20; peduncles with 0–4 coils, 0.5–16.5 × 0.5 mm at flowering time, elongating and 5–30 mm long in fruit, becoming stalk-like after flowering and lifting the flowers to the surface; later often becoming coiled and submerging; bract 1. |
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Flowers | perianth 0; stamens 2; anthers more or less sessile; pistils 2–8; simple; stigmas sessile. |
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Fruits | inconspicuously to short-beaked, slightly recurved; turgid, obliquely ovoid to oblong, 1.8–3 × 0.7–1.5 mm; stalk-like at base. |
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2n | =20. |
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Ruppia maritima |
Ruppiaceae |
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Distribution | ||
Discussion | Shallow waters of saline or brackish streams, ditches, pools, and lakes, along the ocean shore or in alkaline pools in the interior. 0–1300 m. BR, Est. CA, NV,WA; nearly worldwide. Native. |
See family description. 4 species; 1 species treated in Flora. Other sources may refer to freshwater, inland plants of this genus (within Oregon and North America) as R. cirrhosa. A molecular study by Ito et al. (2010), however, concludes that R. cirrhosa is not a distinct species, but rather one of six lineages within the R. maritima species complex. |
Source | Flora of Oregon, volume 1, page 502 Lareina Shipler |
Flora of Oregon, volume 1, page 502 |
Synonyms | Ruppia cirrhosa, Ruppia maritima var. maritima, Ruppia maritima var. obliqua, Ruppia maritima var. rostrata | |
Web links |
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