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Key to families | Table of families and genera

Specimen numbers are hyperlinked to records in the Consortium of California Herbaria data view where possible. Taxa are hyperlinked to entries in the Jepson Interchange via the "[Online Interchange]" link.

 

STUCKENIA PONDWEED
Perennial herb, rhizomed, tubered or not, winter buds 0. Stem: branched, cylindric. Leaf: submersed, sessile, channeled, entire, tip acute to abruptly pointed, notched, or rounded, veins 1–5; stipules fused to leaf blade >= 2/3 stipule length. Inflorescence: submersed; peduncle flexible. Fruit: beaked or not, keel 0.
x=13.
±7 species: worldwide.
Unabridged references: [Börner 1912 Botanisch-systematische Notizen. Abh. Naturwiss. Vereine Bremen 21:245–282; Holub 1977 Preslia 69:361–366]

Key to Stuckenia

1. Leaf tip notched, blunt, rounded, rarely with abrupt, short point; stipule sheaths on proximal stems often inflated, others not; fruit beak inconspicuous ..... S. filiformis subsp. alpina

1' Leaf tip acute or with abrupt, short to long point, rarely rounded; stipule sheaths not inflated; fruit beak conspicuous

2. Leaves 0.2–1 mm wide, tip acute or with abrupt, short to medium-long point; inflorescence axillary or terminal; fruit 2.5–5 mm ..... S. pectinata

2' Leaves (0.4)1.5–5(8.5) mm wide, tip with abrupt, medium-long to long point, rarely rounded; inflorescence axillary, rarely terminal; fruit 3–3.9 mm ..... S. striata

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
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