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sulphur lupine

Kincaid's lupine, sulfur lupine, sulphur lupine

Habit Herbs, perennial, (3–)4–8(–10) dm, hairs stiff to silky-appressed, whitish, grayish, or brownish.
Stems

erect, densely tufted, unbranched distally.

Leaves

leaflet blade surfaces abaxially hairy-strigulose, adaxially strigose-silky to sparsely hairy or glabrous.

basal and cauline, persisting until after flowering;

stipules 4–8 mm;

proximal petioles 4–20 cm, distal ones 1.5–5 cm;

leaflets 6–15, blades white to greenish, (20–)25–70 × 4–10 mm, abaxial surface hairy-strigulose or sericeous, adaxial surface strigulose-silky to sparsely hairy or glabrous.

Racemes

(5–)12–20 cm.

6–20 cm;

flowers whorled or spirally arranged.

Peduncles

3–5 cm.

2.5–6 cm;

bracts tardily deciduous, 5–9 mm.

Pedicels

(2–)4–10 mm.

Flowers

8–12 mm;

calyx asymmetrical but not spurred, silky, abaxial lobe entire, 4–7 mm, adaxial lobe 2-fid, 3–5 mm;

corolla pale sulfur yellow, blue, or white, banner glabrous or sparsely hairy abaxially (pubescence extending above calyx as a line), upper keel margins usually ciliate most of length, sometimes glabrous.

Corollas

usually pale sulfur yellow, sometimes white to bluish.

Legumes

2–3 cm, pilose to silky.

Cotyledons

deciduous, petiolate.

Seeds

4 or 5, pinkish brown.

2n

= 48.

Lupinus sulphureus var. sulphureus

Lupinus sulphureus

Distribution
from USDA
w North America
[WildflowerSearch map]
[BONAP county map]
Discussion

Flowers Apr–Aug. Prairies, sagebrush scrub, open conifer forests; 50–3000 m; B.C.; Idaho, Mont., Oreg., Wash.

Variety sulphureus is known from British Columbia southward along the eastern edge of the Cascades in Washington and northeastern Oregon, eastward to Idaho and Montana. It may be found along the Columbia River to the Willamette River Valley and into southwestern Washington.

(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. Racemes (5–)12–20 cm; flowers usually sulfur yellow (ranging from white to occasionally blue); leaflet blade adaxial surface strigose-silky to sparsely hairy or glabrous, abaxial surface hairy strigulose.
var. sulphureus
1. Racemes 7–10(–11) cm; flowers blue to white; leaflet blade surfaces ± equally strigulose or sericeous.
var. bingenensis
Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Lupinus > Lupinus sulphureus Fabaceae > subfam. Faboideae > Lupinus
Sibling taxa
L. sulphureus var. bingenensis
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. 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. texensis, L. tidestromii, L. tracyi, L. truncatus, L. uncialis, L. villosus, L. westianus
Subordinate taxa
L. sulphureus var. bingenensis, L. sulphureus var. sulphureus
Synonyms L. sulphureus var. applegateianus, L. sulphureus var. echlerianus
Name authority unknown Douglas in W. J. Hooker: Fl. Bor.-Amer. 1: 166. (1832)
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