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Lupinus croceus

Mt. Eddy lupine, saffron-flower lupine

Habit Herbs, perennial, 4–6 dm, green, hairy.
Stems

erect or ascending, clustered, unbranched or branched.

Leaves

cauline;

stipules not leaflike, green to silvery, 4–10 mm;

petiole 2–8 cm;

leaflets 5–9, blades 30–60 × 3–10 mm, adaxial surface pubescent or glabrous.

Racemes

6–28 cm;

flowers whorled or not.

Peduncles

2–6 cm;

bracts tardily deciduous, 2–7 mm.

Pedicels

3–6 mm.

Flowers

12–15 mm;

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

corolla bright yellow to orange-yellow, banner usually glabrous abaxially, sparsely hairy on ridge, keel upcurved, glabrous.

Legumes

2–3.5 cm, hairy.

Cotyledons

deciduous, petiolate.

Seeds

3–5, mottled tan, 6–8 mm.

Lupinus croceus

Phenology Flowering May–Aug.
Habitat Dry, rocky places, yellow pine and fir forests, montane chaparral.
Elevation 900–2700 m. [3000–8900 ft.]
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Lupinus croceus is known from the Cascade and Klamath ranges.

Herbs with spreading hairs and subequal calyx lobes have been called var. pilosellus.

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

Source FNA vol. 11.
Parent taxa 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. 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. croceus var. pilosellus, L. pilosellus
Name authority Eastwood: Leafl. W. Bot. 2: 126. (1938)
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