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|Family: Typhaceae||View Description||Dichotomous Key|
|Genus: Sparganium||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Sparganium angustifolium Michx.
Habit: Plants generally aquatic, limp, <= 2.5 m, distally floating, occasionally terrestrial and erect to emergent, to +- 35 cm. Leaf: widest blades 1--5 mm wide, +- flat, or convex, or generally some obscurely 3-angled or keeled. Inflorescence: emergent; main axis branches 0; staminate heads 3--4(5), crowded in flower; pistillate heads 1--3, proximal in axils, peduncled, distal sessile, 1.5--2 cm diam in fruit. Flower: perianth parts not dark-thickened distally; stigma (0.6)0.8--1.5 mm. Fruit: body 3--4 mm, 1.5--2 mm wide, ellipsoid to fusiform, distally tapered, beak 1.5--2.2 mm. Chromosomes: 2n=30.
Ecology: Locally common. Shallow to deep, nutrient-poor water, lakes, ponds, streams, occasionally +- terrestrial; Elevation: 1800--3100 m. Bioregional Distribution: KR, SNH; Distribution Outside California: to Alaska, northeastern North America; circumboreal. Flowering Time: Jun--Aug
Unabridged Note: As some plants are intermediate between Sparganium angustifolium and Sparganium emersum in one or more defining characters and may be hybrids, it may be preferable to combine these 2 species under Sparganium emersum s.l. The 3-angled or keeled leaf blade shapes, presumably diagnostic of Sparganium emersum, are common in California plants that are otherwise typical of Sparganium angustifolium but are very difficult to see in many pressed specimens.
eFlora Treatment Author: S. Galen Smith
Jepson Online Interchange
Previous taxon: Sparganium
Next taxon: Sparganium emersum
Citation for this treatment: S. Galen Smith 2016. Sparganium angustifolium, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=45023, accessed on May 26, 2016.
Citation for the whole project: Jepson Flora Project (eds.) 2016. Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html, accessed on May 26, 2016.