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Lupinus brevicaulis

sand lupine, short stem blue lupine, short-stem lupine

arctic lupine

Habit Herbs, annual, usually less than 1 dm, pubescent, hairs more than 1 mm. Herbs, perennial, 1–4 dm, hairs thinly appressed silky-sericeous, or few to many and spreading; caudex superficial, divisions closely tufted.
Stems

very short, tufted, branched.

ascending to erect, hollow, tufted, branched at crown.

Leaves

cauline, crowded near base;

stipules well developed;

petiole 1–6 cm;

leaflets (3 or)5–9, blades 8–20 × 2–9 mm, adaxial surface glabrous.

mostly basal with a few cauline proximal to inflorescences;

stipules 8–10 mm;

petiole 5–19 cm;

leaflets 6–10, blades 13–90 × 10–15 mm, abaxial surface thinly strigose, adaxial surface glabrous.

Racemes

dense, 3–16-flowered, 1–8 cm;

flowers spirally arranged, crowded.

5–8(–15 in fruit) cm;

flowers spirally arranged or in 3–7 whorls.

Peduncles

1–8(–10) cm;

bracts persistent, straight, 2–3 mm.

4–8.5 cm;

bracts caducous to tardily deciduous, 8–14 mm.

Pedicels

0.3–1.5 mm.

4–6 mm.

Flowers

6–8 mm;

calyx abaxial lobe entire or shallowly cleft, ± 6 mm, adaxial lobe 2-toothed, 3 mm, less than 1/2 as long as abaxial;

corolla bright blue, banner spot white or yellow, keel glabrous.

14–19(–21) mm;

calyx bulge or spur 0–1 mm, abaxial lobe 6–11 mm, entire or faintly notched at tip, adaxial lobe ± gibbous basally, adaxial lobe teeth with slight notch at tip, 4–8 mm;

corolla usually blue to purplish, sometimes pink, rarely white, banner spot white or yellow, sometimes becoming purple, banner glabrous abaxially, lower keel margins densely ciliate near claw or glabrous or sparsely ciliate towards tip, adaxial margin glabrous or sparsely ciliate towards tips.

Legumes

not undulate, 1 cm, thinly pilose to coarsely hirsute.

2–4.3 cm, silky-pilose.

Cotyledons

persistent, disclike, sessile.

deciduous, petiolate.

Seeds

1 or 2, smooth.

5–8, mottled.

2n

= 48.

Lupinus brevicaulis

Lupinus arcticus

Phenology Flowering spring. Flowering Jun–Aug.
Habitat Sandy washes, open areas, grasslands, pinyon pine-juniper forests, creosote bush scrub, mesquite. Well-drained hummocks of alpine and arctic tundra, moist to mesic meadows, gravel bars, clearings, roadsides, thickets, open forests.
Elevation 300–2400 m. (1000–7900 ft.) 0–2000 m. (0–6600 ft.)
Distribution
from FNA
AZ; CA; CO; NM; NV; OR; UT; WY; Mexico (Chihuahua, Sonora)
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; BC; NT; NU; YT
[WildflowerSearch map]
[BONAP county map]
Discussion

Lupinus brevicaulis resembles L. flavoculatus except that its flowers are smaller.

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

The relationship between Lupinus arcticus and L. latifolius is unclear. They may be distinguished by the presence of proximal keel ciliation in L. latifolius, and basal rather than cauline leaves dominating in L. arcticus.

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

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. 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. 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
L. adsurgens, L. affinis, L. albicaulis, L. albifrons, L. andersonii, L. angustiflorus, L. antoninus, L. apertus, L. arboreus, L. arbustus, 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. 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
Synonyms L. borealis, L. donnellyensis, L. gakonensis, L. multicaulis, L. multifolius, L. nootkatensis var. kjellmannii, L. polyphyllus subsp. arcticus, L. toklatensis, L. yukonensis
Name authority S. Watson: Botany (Fortieth Parallel), 53, plate 7, figs. 1–4. (1871) S. Watson: Proc. Amer. Acad. Arts 8: 526. (1873)
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