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mountain hollyhock, streambank globe-mallow, streambank globe-mallow or wild hollyhock, streambank wild hollyhock

large-flower wild hollyhock

Stems

0.5–2 m;

herbage sparsely stellate-hairy.

1–2 m;

herbage sparsely stellate-pubescent to glabrate.

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.

blades deeply 5- or 7-lobed, 6–13 cm wide, lobes lanceolate to triangular, middle lobe ± equaling to 2 times length of lateral lobes, 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.

clusters forming interrupted spikes to racemes;

involucellar bractlets lanceolate-ovate, 8–12 × 2–3 mm, 3/4 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.

calyx 11–18 mm, lobes triangular-ovate, 8–10 × 5–8 mm, broader than long, exceeding tube, densely villous-hirsute;

petals pink, drying purplish, 2–3 cm.

Seeds

(2 or)3 or 4, dark brown, 2 mm, puberulent.

2 or 3, dark brown, 2.5–3 mm, muricate, with few simple hairs.

Schizocarps

10–12 mm diam.;

mericarps 8–12, 6–10 mm.

12–15 mm diam.;

mericarps 12, 10 mm.

2n

= 66.

Iliamna rivularis

Iliamna grandiflora

Phenology Flowering Jun–Aug. Flowering Jun–Aug.
Habitat Stream banks, meadows, open woodlands, disturbed places, foothills to mountain slopes Wet mountain meadows, open woodlands, stream courses
Elevation 1400–2900 m (4600–9500 ft) 2000–2700 m (6600–8900 ft)
Distribution
from FNA
CO; ID; MT; NM; NV; OR; UT; WA; WY; AB; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
AZ; CO; NM; UT
[BONAP county map]
Discussion

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 6, p. 270. FNA vol. 6, p. 271.
Parent taxa Malvaceae > subfam. Malvoideae > Iliamna Malvaceae > subfam. Malvoideae > Iliamna
Sibling taxa
I. bakeri, I. corei, I. crandallii, I. grandiflora, I. latibracteata, I. longisepala, I. remota
I. bakeri, I. corei, I. crandallii, I. latibracteata, I. longisepala, I. remota, I. rivularis
Synonyms Malva rivularis, I. acerifolia, I. rivularis subsp. diversa, I. rivularis var. diversa, Phymosia acerifolia, P. rivularis, Sphaeralcea acerifolia, S. rivularis, S. rivularis var. diversa Sphaeralcea grandiflora, I. angulata, Phymosia grandiflora
Name authority (Douglas) Greene: Leafl. Bot. Observ. Crit. 1: 206. (1906) (Rydberg) Wiggins: Contr. Dudley Herb. 1: 223. (1936)
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