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Arizona lupine

Habit Herbs, annual, 1–6 dm, with short-appressed and long, spreading hairs.
Stems

erect, usually branched, sometimes unbranched.

Leaves

cauline;

petiole 2–8 cm;

leaflets 5–10, blades 10–40 × 4–12 mm, adaxial surface glabrous.

Racemes

6–30 cm;

flowers spirally arranged or appearing ± whorled proximally.

Peduncles

1–6 cm;

bracts usually persistent, 4–8 mm.

Pedicels

2–4 mm.

Flowers

7–10 mm;

calyx 3–6 mm, lobes ± equal, abaxial lobe entire, adaxial lobe deeply cleft;

corolla banner and wings dark pink to magenta, drying blue-purple or whitish, banner spot yellowish, becoming darker magenta, lower keel margins ciliate near claw, upper margins glabrous.

Legumes

often secund, 1–2 cm, coarsely pubescent.

Cotyledons

deciduous, petiolate.

Seeds

4–6.

2n

= 48.

Lupinus arizonicus

Phenology Flowering spring.
Habitat Sandy washes, open areas.
Elevation 0–1100 m. (0–3600 ft.)
Distribution
from FNA
AZ; CA; NV; Mexico (Baja California, Baja California Sur, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

Lupinus arizonicus occurs in the eastern Mojave and Sonora deserts of southeastern California, southwestern Arizona, and southern Nevada, plus adjacent areas in northern Mexico.

Robust plants have been named var. barbatulus.

(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. 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. concinnus var. arizonicus, L. arizonicus var. barbatulus, L. brevior, L. concinnus var. brevior, L. sparsiflorus var. arizonicus, L. sparsiflorus var. barbatulus
Name authority (S. Watson) S. Watson: Proc. Amer. Acad. Arts 12: 250. (1877)
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