Physocarpus monogynus

(Torrey) J. M. Coulter

Contr. U.S. Natl. Herb. 2: 104. 1891.

Common names: Mountain nine-bark
Basionym: Spiraea monogyna Torrey Ann. Lyceum Nat. Hist. New York 2: 194. 1827
Treatment appears in FNA Volume 9. Treatment on page 350. Mentioned on page 347, 348.

Shrubs, 10 dm. Stems often decumbent, spreading, reddish brown becoming dark gray, glabrous or sparsely stellate-hairy. Leaves: stipules linear to narrowly elliptic or subulate, 4–5 × 1 mm, base attenuate, apex acute; petiole 0.5–2.2 cm; blade broadly ovate, 1.5–4 × 2–4.5 cm, sometimes wider than long, base usually truncate to cordate, rarely broadly cuneate, 0 or 1–5-lobed, margins doubly crenate to doubly serrate, apex rounded to obtuse, surfaces glabrous or sparsely stellate-hairy. Inflorescences 10(–15)–30-flowered, fairly dense, hemispheric racemes, 4 cm diam.; bracts linear to narrowly elliptic or narrowly obovate, 2–4 mm, apex acute, rarely 2-fid. Pedicels 8–18 mm, sparsely to moderately stellate-hairy. Flowers 8–10 mm diam.; hypanthium cup-shaped, 1.7–2 mm, sparsely to moderately stellate-hairy; sepals triangular to ovate, 3 mm, apex gland-tipped, surfaces sparsely to moderately stellate-hairy; petals white, broadly elliptic to orbiculate, 4.5 × 4 mm; stamens 20–40, ± equal to petals; carpels (1)2(3), connate at least 1/2 their lengths, densely stellate-hairy. Follicles (1)2(3), inflated, 2.5 mm (lengths shorter than sepals), densely stellate-hairy, hairs white; styles 3.5 mm. Seeds 1–3, pyriform, 2–2.5 mm. 2n = 18.

Phenology: Flowering May–Aug; fruiting Jul–Oct.
Habitat: Open rocky wooded slopes, seepage ledges, canyons
Elevation: 1800–2600 m


V9 576-distribution-map.jpg

Ariz., Colo., Mont., Nev., N.Mex., Okla., S.Dak., Tex., Utah, Wyo.


Selected References


Lower Taxa

... more about "Physocarpus monogynus"
Crinan Alexander +
(Torrey) J. M. Coulter +
Spiraea monogyna +
Mountain nine-bark +
Ariz. +, Colo. +, Mont. +, Nev. +, N.Mex. +, Okla. +, S.Dak. +, Tex. +, Utah +  and Wyo. +
1800–2600 m +
Open rocky wooded slopes, seepage ledges, canyons +
Flowering May–Aug +  and fruiting Jul–Oct. +
Contr. U.S. Natl. Herb. +
Physocarpus monogynus +
Physocarpus +
species +