Iliamna rivularis

(Douglas) Greene

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

Common names: Streambank globe-mallow or wild hollyhock
EndemicSelected by author to be illustrated
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 unknown S. rivularis unknown S. rivularis var. diversa A. Nelson
Treatment appears in FNA Volume 6. Treatment on page 270.
Click plate for higher resolution version.
Illustrator: Linny Heagy
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.



Lower Taxa

No lower taxa listed.

Facts about "Iliamna rivularis"
AuthorDavid M. Bates +
Authority(Douglas) Greene +
BasionymsMalva rivularis +
Common nameStreambank globe-mallow or wild hollyhock +
DistributionAlta. +, B.C. +, Colo. +, Idaho +, Mont. +, Nev. +, N.Mex. +, Oreg. +, Utah +, Wash. + and Wyo. +
Elevation1400–2900 m +
HabitatStream banks, meadows, open woodlands, disturbed places, foothills to mountain slopes +
IllustratorLinny Heagy +
PhenologyFlowering Jun–Aug. +
Publication titleLeafl. Bot. Observ. Crit. +
Publication year1906 +
ReferenceNone +
Source xml grained fna xml/V6/V6 489.xml +
Special statusEndemic + and Selected by author to be illustrated +
SynonymsIliamna acerifolia +, I. rivularis subsp. diversa +, I. rivularis var. diversa +, Phymosia acerifolia +, P. rivularis +, Sphaeralcea acerifolia +, S. rivularis + and S. rivularis var. diversa +
Taxon familyMalvaceae +
Taxon nameIliamna rivularis +
Taxon parentIliamna +
Taxon rankspecies +
VolumeVolume 6 +