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Photo is of parent taxon

indigo bush, Napa false indigo, Napa false indigo or indigo-bush

California false indigo, false indigo

Habit Shrubs glabrous or glabrate. Shrubs, (0.7–)1–3(–4) m; arising from compact, woody root.
Stems

smooth, often with spinelike glands, mostly short-pilose to puberulent, glabrate, or glabrous.

Leaves

(5–)10–20 cm;

stipules linear to narrowly oblong, (2–)4–6 mm;

petiole (7–)10–15(–25) mm, glands spinelike, scattered, puberulent or glabrous;

rachis glands spinelike, puberulent to short-pilose;

leaflets (11–)13–19(–25), stipels acicular, 1–1.5 mm, petiolule 0.7–1.5(–1.8) mm, gland-dotted, pilosulous or glabrous, blade mostly oblong, (8–)15–25(–42) × (6–)10–15(–20) mm, base round to subcordate, margins not revolute, entire or finely crenulate, apex round to obtuse or emarginate, surfaces puberulent to short-pilose or glabrous;

midveins terminated by a swollen, globose mucro, 0.2–0.5 mm.

Leaflets

blade surfaces glabrous, except midveins adaxially pubescent.

Racemes

unbranched, (5–)10–18(–25) cm;

rachis often with spinelike glands, pilose;

bracteoles linear to lanceolate, 1.5–4 mm, usually gland-dotted, sometimes eglandular, short-pilose.

Pedicels

0.3–1.2 mm, eglandular, mostly puberulent to short-pilose.

Flowers

calyx tube narrowly cylindric to funnelform, 2–2.8 mm, distal 1/2 sometimes gland-dotted, puberulent, short-pilose, or glabrous;

lobes triangular to narrowly lanceolate, 0.4–2(–2.5) mm;

banner reddish purple, broadly obovate, 5–7 × 2.5–4 mm, indistinctly clawed, margins entire;

filaments 6–7 mm, connate basally 2–3.2 mm;

anthers pale yellow;

ovary mostly densely short-pilose.

Calyces

tube glab-rous or sparsely short-pilose;

lobes 0.4–0.8(–1) mm.

Legumes

sessile, 6–8 × 2.5–3.5 mm, margins curved outward abaxially, straight adaxially, at least distal 1/2 gland-dotted, mostly short-pilose.

Seeds

olive brown or reddish brown, 3–4 × 1.5–2 mm, smooth.

Amorpha californica var. napensis

Amorpha californica

Phenology Flowering May–Jul.
Habitat Wooded or chaparral slopes.
Elevation 100–600 m. (300–2000 ft.)
Distribution
from FNA
CA
[BONAP county map]
from USDA
w United States; nw Mexico
[WildflowerSearch map]
[BONAP county map]
Discussion

Of all taxa of Amorpha in the flora area, A. californica is one of the most distinctive, due to the presence of spinelike glands. Of the two varieties, var. californica is the more widespread and common, with var. napensis a localized endemic in a small portion of northern California (Marin, Napa, and Sonoma counties). At this time, var. napensis is not listed by the state of California or any federal agency.

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

Varieties 2 (2 in the flora).

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

Key
1. Shrubs mostly short-pilose or puberulent; calyx tubes puberulent to short-pilose, lobes (0.8–)1–.
→ 2(–2
2(–2. 5) mm.
var. californica
1. Shrubs glabrous or glabrate; calyx tubes glabrous or sparsely short-pilose, lobes 0.4–0.8(–1) mm.
var. napensis
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Amorpha > Amorpha californica Fabaceae > subfam. Faboideae > Amorpha
Sibling taxa
A. californica var. californica
A. canescens, A. confusa, A. crenulata, A. fruticosa, A. georgiana, A. glabra, A. herbacea, A. laevigata, A. nana, A. nitens, A. ouachitensis, A. paniculata, A. roemeriana, A. schwerinii
Subordinate taxa
A. californica var. californica, A. californica var. napensis
Name authority Jepson: Man. Fl. Pl. Calif., 556. (1925) Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 306. (1838)
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