Psorothamnus schottii
Psorothamnus fremontii
indigo-bush, Schott's dalea, Schott's indigo-bush
Fremont's dalea, Fremont's indigo bush, Frémont's dalea, Frémont's indigo bush
1–2.5 dm, eglandular and usually glabrous or sparsely strigulose when young, rarely canescent.
3–10 dm, ± eglandular when young, strigulose.
divaricate;
sterile shoots on shorter lateral branches sharp-tipped.
irregular;
sterile shoots not or faintly sharp-tipped.
unifoliolate or pinnate, (0.7–)1–3 cm;
leaflets 1 (or 3), blades linear, 6–30 mm, terminal leaflet longer than laterals, surfaces usually glabrous with glandular margins abaxially, densely silvery-pubescent adaxially.
pinnate, 1–4 cm;
leaflets 3–7(or 9), blades obovate to linear-elliptic, linear-oblanceolate, or linear, (2–)3–25 mm, terminal leaflet seldom longer than laterals, surfaces gland-dotted abaxially, strigulose, more strongly so adaxially.
loose;
rachis without thornlike tip in anthesis, 1–9 cm;
bracts triangular-subulate, 0.5–1.3 mm;
bracteoles present.
loose;
rachis without thornlike tip in anthesis, 2–9(–11) cm;
bracts subulate, 1.2–2 mm;
bracteoles present.
calyx (4–)4.6–5.7(–6.5) mm, glabrous or strigulose externally, tube (2.8–)3.3–4.3(–4.6) mm, ribs prominent, narrow abaxial intervals each with 1–5 glands in 1 row, broader adaxial intervals each with 1–17 glands in 2 rows, lobes ovate-deltate to triangular, abaxial lobe slightly shorter and narrower;
corolla deep blue, banner with yellow eye;
banner flabellate, (6.4–)7.1–10.5 mm, tapered to cuneate claw, apex retuse;
wings broadly oblong, (6–)7–8.6 × 3–4.2 mm;
keel broadly oblong, (6.1–)6.5–8(–8.8) × 3.7–4.7 mm;
stamens 7–11 mm;
filaments distinct to 3.5–6.5 mm;
anthers 0.9–1.3 mm, connective not gland-tipped.
calyx (5–)5.4–7.7 mm, glabrous or strigulose externally, tube (5–)5.4–7.7 mm, ribs prominent, intervals each with 1 row of 2–5 glands, adaxial ones with 4–7 scattered glands, lobes lanceolate or triangular-lanceolate, abaxial lobe becoming reflexed, nearly equal but narrower;
corolla magenta-purple;
banner flabellate to flabellate-ovate, 7.3–9.3 mm, base cuneate or auriculate, claw cuneate;
wings oblong to oblong-ovate, 6.1–7.3 × (2.6–)2.8–3.8 mm;
keel obliquely obovate, (6–)6.4–7.5 × (3.6–)4–4.7 mm;
stamens 6.6–9.1 mm;
filaments distinct to 3.2–4.4 mm;
anthers (0.7–)0.9–1.2 mm, connective not gland-tipped.
obovoid, 7–10 mm, with large, separate glands, puberulent distally.
obliquely obovoid, 7–10 mm, with numerous blister-glands, glands confluent into vertical ridges, glabrous or glabrate.
6–8 mm.
4.4–5.8 mm.
= 20.
Psorothamnus schottii
Psorothamnus fremontii
In California, Psorothamnus schottii is known from the Sonoran Desert regions in the very southeastern parts of the state.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Varieties 2 (2 in the flora).
Psorothamnus fremontii is often separated from P. arborescens with difficulty because the critical distinction requires mature fruit. Most other features are too variable or overlapping to be of much use. Flowering specimens can usually be identified if the location of the collection is considered, since the two species are largely allopatric. Psorothamnus fremontii is confined to southeastern California, southern Nevada, northern and western Arizona, and south-central Utah; P. arborescens is found mainly west and north of P. fremontii in California, Nevada, and northwestern Mexico, except for var. pubescens, which occurs with P. fremontii in north-central Arizona and south-central Utah.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaflet blades obovate to linear-elliptic or linear-oblanceolate, (2–)3–15(–20) × 1.5–2(–4) mm. | var. fremontii |
1. Leaflet blades linear, (3–)5–25 × 0.7–1(–1.2) mm. | var. attenuatus |
CA
WildflowerSearch
iNaturalist
USDA Plants Database
