Berberis nervosa |
Berberidaceae |
|
---|---|---|
Cascade Oregon grape |
barberry family |
|
Habit | Shrubs 1–6 dm. | Shrubs or herbs perennial, rhizomatous. |
Stems | monomorphic; without short axillary shoots; twigs glabrous; bud scales (13)20–44 mm, persistent; spines absent. |
sometimes spiny. |
Leaves | compound; leaflets 9–21; thin and ± flexible; smooth but rather dull abaxially; dull and somewhat glaucous adaxially; terminal leaflet 2.9–8.4 × 1.2–4.8 cm, 1.8–3.2 × as long as wide; lateral leaflets lance-ovate to ovate, 4–6-veined from base, bases rounded to cordate; margins plane; each margin with 6–13 teeth 1–2(3) mm, tipped with spines to 1.0–2.4 × 0.1–0.2 mm; tips acute or broadly acuminate; petioles 2–11 cm. |
basal or alternate; simple or pinnately or ternately compound. |
Inflorescences | 30–70-flowered, 6–17 cm; bracts acute, obtuse or rounded. |
racemes; panicles; umbels, or spikes. |
Flowers | radially symmetric; bisexual, hypogynous; hypanthium absent, sometimes with 3–9 bractlets forming an epicalyx appressed to calyx; sepals 6; free, sometimes falling as flowers open, or absent; petals 6; free; showy, producing nectar, or absent; stamens 6–18; free and distinct, often same number as petals and opposite them; anthers opening by apical flaps or longitudinal slits; pistils 1; superior; placentation basal or lateral; styles short or obsolete. |
|
Stamens | filaments without teeth. |
|
Fruits | oblong-ovoid or globose, 8–11 mm, blue, glaucous. |
berries or capsules. |
Seeds | 1–10 per fruit, sometimes bearing an aril. |
|
Berberis nervosa |
Berberidaceae |
|
Distribution | ||
Discussion | Open or shaded woods, rocky areas. Flowering Mar–Jun. 0–2200 m. BW, Casc, CR, ECas, Est, Sisk, WV. CA, ID, WA; north to British Columbia. Native. |
East Africa, Asia, Europe, North America, South America. 15 genera; 3 genera treated in Flora. The structure of the pistil in Berberidaceae can be confusing, and its homologies are uncertain. Berberidaceae taxa have a single pistil with a single unlobed stigma and an ovary having a single locule. Most taxa have one or a group of basal ovules. A few taxa (including Vancouveria) have more complex pistils, but their structure is difficult to interpret. It is uncertain whether the pistil evolved from a single carpel, like the pistils of Ranunculaceae, or from several fused carpels, as in Papaveraceae (Cronquist 1981). |
Source | Flora of Oregon, volume 2, page 376 Alan Whittemore |
Flora of Oregon, volume 1 |
Sibling taxa | ||
Synonyms | Mahonia nervosa | |
Web links |
|
|