The green links below add additional plants to the comparison table. Blue links lead to other Web sites.
enable glossary links
Lupinus pusillus

intermountain lupine, low lupine, rusty lupine

Brewer's lupine, Matted lupine

Habit Herbs, annual, 0.5–2 dm, sparsely pubescent to pilose, hairs more than 1 mm. Herbs or subshrubs, perennial, to 2 dm, matted or tufted, silvery-silky.
Stems

short and tufted or erect, branched from base or near middle.

prostrate, branched, base ± woody.

Leaves

cauline, often crowded near base;

stipules well developed;

petiole 1–9 cm;

leaflets 5–9, blades 10–40 × 5–10 mm, adaxial surface glabrous.

cauline, clustered near base;

stipules 2–5 mm;

petiole 1–5(–6) cm;

leaflets 5–10, blades 3–20 × 2–6 mm, adaxial surface pubescent.

Racemes

8–12-flowered, 2–11 cm, shorter than or slightly exceeding foliage;

flowers spirally arranged.

dense, 1–10 cm;

flowers whorled.

Peduncles

0–3.5 cm;

bracts persistent, straight, 2–5 mm.

1–3(–8) cm;

bracts deciduous, 3–5 mm.

Pedicels

1–3.5 mm.

1–3(–4) mm.

Flowers

5–12 mm;

calyx abaxial lobe entire, 5–6 mm, adaxial lobe cleft, 2.5–4 mm;

corolla vivid blue, sometimes paler or white, sometimes bicolored, banner spot white or yellowish, keel glabrous.

4–11 mm;

calyx bulge or spur 0–1 mm, abaxial lobe entire or 3-toothed, 4–6 mm, adaxial lobe 2-toothed, 4–7 mm;

corolla blue to violet, banner patch white or yellow, banner glabrous or densely hairy abaxially, keel straight, abaxial margins glabrous, adaxial margin glabrous or ciliate.

Legumes

1.5 cm, constricted between seeds, thinly pilose to coarsely hirsute.

1–2 cm, silky.

Cotyledons

persistent, disclike, sessile.

deciduous, petiolate.

Seeds

2, wrinkled or ridged.

3 or 4, mottled tan, brown, 3–4 mm.

Lupinus pusillus

Lupinus breweri

Distribution
from USDA
w North America; c North America
[WildflowerSearch map]
[BONAP county map]
from USDA
w United States
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 3 (3 in the flora).

Lupinus pusillus is a highly variable species, with the varieties intergrading.

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

Varieties 3 (3 in the flora).

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

Key
1. Peduncles 0–1 cm; racemes shorter than foliage; flowers 6–8 mm.
var. intermontanus
1. Peduncles usually 1–3.5 cm; racemes equal to or longer than foliage; flowers 7–12 mm.
→ 2
2. Pedicels and calyx tubes strigose.
var. pusillus
2. Pedicels and calyx tubes glabrous.
var. rubens
1. Banner silky abaxially, keel strongly ciliate.
var. grandiflorus
1. Banner glabrous abaxially, keel glabrous.
→ 2
2. Flowers 6–9 mm; leaflet blades 6–20 mm.
var. breweri
2. Flowers 4–6(–7) mm; leaflet blades 3–5 mm.
var. bryoides
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Lupinus Fabaceae > subfam. Faboideae > Lupinus
Sibling taxa
L. adsurgens, L. affinis, L. albicaulis, L. albifrons, L. andersonii, L. angustiflorus, L. antoninus, L. apertus, L. arboreus, L. arbustus, L. arcticus, L. argenteus, L. arizonicus, L. benthamii, L. bicolor, L. brevicaulis, L. breweri, L. cervinus, L. chamissonis, L. citrinus, L. concinnus, L. constancei, L. covillei, L. croceus, L. dalesiae, L. diffusus, L. duranii, L. elatus, L. elmeri, L. excubitus, L. flavoculatus, L. formosus, L. fulcratus, L. gracilentus, L. grayi, L. guadalupensis, L. havardii, L. hirsutissimus, L. huachucanus, L. hyacinthinus, L. kingii, L. kuschei, L. lapidicola, L. latifolius, L. lepidus, L. leucophyllus, L. littoralis, L. longifolius, L. ludovicianus, L. luteolus, L. magnificus, L. malacophyllus, L. microcarpus, L. nanus, L. neomexicanus, L. nevadensis, L. nipomensis, L. nootkatensis, L. obtusilobus, L. odoratus, L. onustus, L. oreganus, L. pachylobus, L. padrecrowleyi, L. peirsonii, L. perennis, L. polyphyllus, L. pratensis, L. rivularis, L. sabineanus, L. sericatus, L. sericeus, L. shockleyi, L. sierrae-blancae, L. sparsiflorus, L. spectabilis, L. stiversii, L. subcarnosus, L. succulentus, L. sulphureus, L. texensis, L. tidestromii, L. tracyi, L. truncatus, L. uncialis, L. villosus, L. westianus
L. adsurgens, L. affinis, L. albicaulis, L. albifrons, L. andersonii, L. angustiflorus, L. antoninus, L. apertus, L. arboreus, L. arbustus, L. arcticus, L. argenteus, L. arizonicus, L. benthamii, L. bicolor, L. brevicaulis, L. cervinus, L. chamissonis, L. citrinus, L. concinnus, L. constancei, L. covillei, L. croceus, L. dalesiae, L. diffusus, L. duranii, L. elatus, L. elmeri, L. excubitus, L. flavoculatus, L. formosus, L. fulcratus, L. gracilentus, L. grayi, L. guadalupensis, L. havardii, L. hirsutissimus, L. huachucanus, L. hyacinthinus, L. kingii, L. kuschei, L. lapidicola, L. latifolius, L. lepidus, L. leucophyllus, L. littoralis, L. longifolius, L. ludovicianus, L. luteolus, L. magnificus, L. malacophyllus, L. microcarpus, L. nanus, L. neomexicanus, L. nevadensis, L. nipomensis, L. nootkatensis, L. obtusilobus, L. odoratus, L. onustus, L. oreganus, L. pachylobus, L. padrecrowleyi, L. peirsonii, L. perennis, L. polyphyllus, L. pratensis, L. pusillus, L. rivularis, L. sabineanus, L. sericatus, L. sericeus, L. shockleyi, L. sierrae-blancae, L. sparsiflorus, L. spectabilis, L. stiversii, L. subcarnosus, L. succulentus, L. sulphureus, L. texensis, L. tidestromii, L. tracyi, L. truncatus, L. uncialis, L. villosus, L. westianus
Subordinate taxa
L. pusillus var. intermontanus, L. pusillus var. pusillus, L. pusillus var. rubens
L. breweri var. breweri, L. breweri var. bryoides, L. breweri var. grandiflorus
Name authority Pursh: Fl. Amer. Sept. 2: 468. 1814[1813] A. Gray: Proc. Amer. Acad. Arts 7: 334. (1868)
Web links