Iliamna rivularis

(Douglas) Greene

Leafl. Bot. Observ. Crit. 1: 206. 1906. 1906

Common names: Streambank globe-mallow or wild hollyhock
Basionyms: Malva rivularis Douglas in W. J. Hooker, Fl. Bor.-Amer. 1: 107. 1831
Synonyms: Iliamna acerifolia (Torrey & A. Gray) Greene I. rivularis subsp. diversa (A. Nelson) Wiggins I. rivularis var. diversa (A. Nelson) C. L. Hitchcock Phymosia acerifolia Torrey & AGray P. rivularis (Douglas) Torrey Sphaeralcea acerifolia S. rivularis S. rivularis var. diversa A. Nelson
Treatment appears in FNA Volume 6. Treatment on page 270.

Stems 0.5–2 m; herbage sparsely stellate-hairy. Leaf blades deeply (3-), 5-, or 7-lobed, 5–20 cm wide, lobes triangular-ovate, broadest at base, base truncate to cordate, margins coarsely dentate. Inflorescences clusters forming interrupted spikes to corymbose racemes distally; involucellar bractlets linear-subulate, 3–6(–8) × 1 mm, 1/3–2/3 as long as calyx. Flowers: calyx 5–8(–11) mm, lobes triangular-ovate to obtuse, 2.5–4(–5.5) mm, ± as wide as long, slightly exceeding tube; petals pinkish white to rose-purple, 1.8–2.5 cm. Schizocarps 10–12 mm diam.; mericarps 8–12, 6–10 mm. Seeds (2 or)3 or 4, dark brown, 2 mm, puberulent. 2n = 66.

Phenology: Flowering Jun–Aug.
Habitat: Stream banks, meadows, open woodlands, disturbed places, foothills to mountain slopes
Elevation: 1400–2900 m


V6 489-distribution-map.jpg

Alta., B.C., Colo., Idaho, Mont., Nev., N.Mex., Oreg., Utah, Wash., Wyo.


Iliamna rivularis is variable in stature, pubescence, and leaf characters. Plants of Idaho and Wyoming with distally smaller (4–10 cm), three- to five-lobed blades, truncate bases, and inconspicuously toothed margins have been recognized as var. or subsp. diversa, but fall within the morphological range of the species as a whole.

Iliamna rivularis is in the Center for Plant Conservation’s National Collection of Endangered Plants as I. rivularis var. rivularis.

Selected References


Lower Taxa


... more about "Iliamna rivularis"
David M. Bates +
(Douglas) Greene +
Malva rivularis +
Streambank globe-mallow or wild hollyhock +
Alta. +, B.C. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wash. +  and Wyo. +
1400–2900 m +
Stream banks, meadows, open woodlands, disturbed places, foothills to mountain slopes +
Flowering Jun–Aug. +
Leafl. Bot. Observ. Crit. +
Endemic +  and Illustrated +
Iliamna acerifolia +, I. rivularis subsp. diversa +, I. rivularis var. diversa +, Phymosia acerifolia +, P. rivularis +, Sphaeralcea acerifolia +, S. rivularis +  and S. rivularis var. diversa +
Iliamna rivularis +
species +