Flora of North America species comparison

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Lupinus arbustus

Lupinus angustiflorus
Lupinus arbustus

grassland lupine (ssp. neolaxiflorus), long-spur lupine, Montana lupine (ssp. pseudoparviflorus), spur lupine

narrow flower lupine
Habit Herbs, perennial, 2–7 dm, green or gray-silky. Herbs, perennial, 5–12 dm, green, glabrous or sparsely hairy.
Stems

erect, ascending, or decumbent, branched.

ascending-erect, branched.
Leaves

cauline and basal;

stipules 4–9 mm;

petiole 2–16 cm;

leaflets 7–10(–13), blades 20–70 × 3–15 mm, adaxial surface strigose.

cauline;

stipules 5–13 mm;

petiole 1–5 cm;

leaflets 6–9, blades 20–60 × 4–8 mm, adaxial surface glabrous or with scattered hairs.
Racemes

open, 3–18 cm;

flowers whorled.

open, 6–34 cm;

flowers spirally arranged.
Peduncles

2–5 cm;

bracts deciduous, 3–6 mm.

1–8 cm;

bracts ± persistent, 3–7 mm.
Pedicels

1–7 mm.

2–4 mm.
Flowers

8–14 mm;

calyx spur distinct, 1–3 mm, abaxial lobe 3-toothed, 2.5–5 mm, 1–3 mm, adaxial lobe 2-toothed, 2–4 mm;

corolla blue, purple, pink, white, or yellowish, banner patch white, yellowish, or absent, banner hairy abaxially, wings with dense hair patch outside near tip, lower keel margins glabrous, adaxial margin ciliate.

8–10(–12) mm;

calyx bulge or spur 0–1 mm, abaxial lobe entire or 3-toothed, 4–9 mm, adaxial lobe 2-toothed, 4–8 mm;

corolla usually pale yellow to orange-yellow, sometimes white, banner patch orange to yellow, keel tip pale lavender, banner usually hairy abaxially, keel glabrous.
Legumes

2–3 cm, silky.

2.5–4 cm, hairy.
Cotyledons

deciduous, petiolate.

deciduous, petiolate.
Seeds

3–6, tan, 5–6 mm.

1–4, speckled tan and brown, 4.5–5.5 mm.

Lupinus arbustus

Lupinus angustiflorus
Phenology Flowering May–Jul. Flowering Jun–Sep.
Habitat Open sagebrush scrub or mixed-conifer forests. Volcanic soils.
Elevation 1500–3000 m. (4900–9800 ft.) 1000–3500 m. (3300–11500 ft.)
Distribution
from FNA
CA; ID; MT; OR; UT; WA; BC
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Lupinus arbustus is known from the Cascade and Klamath ranges, San Gabriel Mountains, Sierra Nevada, and the Great Basin area in California; Owyhee Desert in Idaho and Oregon; eastern Washington and western Montana; and western Juab and Tooele counties, Utah.

Lupinus arbustus is separated from the argenteus group by the presence of hairs on the corolla wings. Recognition of subspecies and varieties of this already complex species leads to precarious separation among taxa.

Lupinus variegatus A. Heller (1912, not Poiret 1814) is an illegitimate name that pertains here.

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

Lupinus angustiflorus is known from the High Cascade Range, the northern and central High Sierra Nevada, and the Great Basin region of northeastern California. It is usually found on volcanic soils associated with yellow pine, red fir, lodgepole pine, and mountain hemlock forests. In Mono County, it is more commonly associated with sagebrush, bitterbrush, rabbitbrush, and wax currant. The persistent bracts, yellow flowers, and abaxial pubescence on the banner clearly separate this taxon from other species.

(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. 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. 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. 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. 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. arbustus subsp. calcaratus, L. arbustus var. montanus, L. arbustus subsp. neolaxiflorus, L. arbustus subsp. pseudoparviflorus, L. arbustus subsp. silvicola, L. caesius, L. caudatus var. submanens, L. caudatus var. subtenellus, L. elegantulus, L. inyoensis var. demissus, L. laxiflorus var. calcaratus, L. laxiflorus var. cognatus, L. laxiflorus var. elmerianus, L. laxiflorus var. lyleianus, L. laxiflorus var. pseudoparviflorus, L. laxiflorus var. silvicola, L. laxiflorus var. villosulus, L. lyleianus, L. mucronulatus var. umatillensis, L. multitinctus, L. noldekeae, L. proteanus, L. pseudoparviflorus, L. silvicola, L. wenatchensis, L. yakimensis L. andersonii var. christinae, L. christinae
Name authority Douglas: Edwards’s Bot. Reg. 15: plate 1230. (1829) Eastwood: Leafl. W. Bot. 2: 226. (1940)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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