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silvery lupine

inch high lupine, lilliput lupine

Habit Herbs, perennial, 1–15 dm, green and glabrous or silvery-hairy; from superficial or shallowly buried root crown. Herbs, annual, 0.1–0.2 dm, pilose.
Stems

erect or ascending, green or purplish, clustered, branched or unbranched.

very short, densely tufted, branched.

Leaves

basal and/or cauline;

stipules 2–12 mm;

petiole 1–15 cm;

leaflets (5 or)6–10, blades 10–60 × 4–10 mm, abaxial surface hairy, adaxial surface glabrous or hairy (but not strigose).

cauline, densely tufted or crowded near base;

free blades of stipules reduced, 1 mm;

petiole 0.4–1.5 cm;

leaflets (3 or)5, blades 2–7 × 1–1.5 mm, adaxial surface villous.

Racemes

loose, 5–16(–25) cm;

flowers whorled or not.

flowers solitary or paired, axillary.

Peduncles

(1–)4–25(–30) cm;

bracts usually deciduous, 3–4 mm.

1.5–4 mm;

bracts persistent, 1 mm.

Pedicels

(1–)2–5(–7) mm.

1 mm.

Flowers

5–15 mm;

calyx 4–8 mm, bulge or spur 0–3 mm (may be variable on plant), abaxial lobe entire or 3-toothed, adaxial lobe entire or 2-toothed;

corolla usually blue, sometimes purple, violet, pink, lilac, or white, banner patch yellowish to whitish, blue, brown, or absent, banner not much reflexed-recurved beyond midpoint, this less than 3 mm proximal to apex, banner glabrous or pubescent abaxially, wings glabrous, lower keel margins glabrous, upper margins ciliate.

4–5 mm;

calyx 2.5–3 mm, abaxial lobe shallowly cleft, 2–2.5 mm, adaxial lobe 2-toothed, 0.5–1 mm;

corolla banner white, wings and keel purplish, keel glabrous.

Legumes

(1–)2–3 cm, hairy or silky.

0.6–1 cm, pilose.

Cotyledons

deciduous, petiolate.

persistent, disclike, sessile.

Seeds

(2 or)3–5(or 6), tan, brown, or red.

1 or 2.

Lupinus argenteus

Lupinus uncialis

Phenology Flowering spring (May–Jun).
Habitat Open areas, barrens, talus in sagebrush and pinyon-juniper woodlands, on limestone, rhyolite, volcanic ash and sinter around hot springs.
Elevation 1400–2400 m. (4600–7900 ft.)
Distribution
from USDA
w North America
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; ID; NV; OR
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 14 (14 in the flora).

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

Lupinus uncialis occurs in the Great Basin of Nevada and extends into California, Idaho, and Oregon.

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

Key
1. Calyx spur 1–3 mm.
→ 2
2. Flowers in profile appearing open, spur pronounced.
var. heteranthus
2. Flowers in profile appearing closed; spur less pronounced.
→ 3
3. Petioles of proximal cauline leaves 1.5–3 cm.
var. argophyllus
3. Petioles of proximal cauline leaves 3–12 cm.
var. utahensis
1. Calyx bulge 0–1 mm, but not elongated into a spur.
→ 4
4. Leaflets oblanceolate, flat, green, surfaces glabrous or adaxially pubescent; plants of cool, moist mountain meadows, stream banks, lakeshores.
→ 5
5. Corollas pale blue with brown banner patch; pedicels 1–2.5 mm.
var. fulvomaculatus
5. Corollas usually blue with yellow banner spot or none; pedicels usually 3–4 mm.
→ 6
6. Stems unbranched and racemes sol­itary, terminal.
var. rubricaulis
6. Stems branched, giving rise to several racemes.
→ 7
7. Corolla wings (7.5–)8–10 mm.
var. argentatus
7. Corolla wings 5–7.5 mm.
var. parviflorus
4. Leaflets oblanceolate or elliptic-oblanceolate, narrow and often folded, surfaces gray or silver-pubescent; plants of dry open areas, foothills to mountains.
→ 8
8. Stem hairs descending in backward direction or widely spreading.
var. palmeri
8. Stem hairs forwardly appressed.
→ 9
9. Flowers large, (7–)8–15 mm.
→ 10
10. Basal and cauline leaves present at flowering.
var. montigenus
10. Basal leaves absent at flowering.
→ 11
11. Flowers (7–)8–12 mm.
var. argenteus
11. Flowers 12–15 mm.
var. moabensis
9. Flowers small, 5–7(–9) mm.
→ 12
12. Banners densely pubescent.
→ 40g
40g. Lupinus argenteus var. holosericeus.
→ 12
12. Banner glabrous or thinly strigulose abaxially.
→ 13
13. Wings 5.5–7 mm; banner usually thinly strigulose abaxially; Kai­bab Plateau, Arizona, Colorado, Nevada, New Mexico, Utah; elevation 2000–2800 m.
var. hillii
13. Wings 5–6 mm; banner glabrous abaxially; Sierra Nevada, California, adjacent Nevada; elevation 1500–3500 m.
var. meionanthus
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. 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. 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. sulphureus, L. texensis, L. tidestromii, L. tracyi, L. truncatus, L. villosus, L. westianus
Subordinate taxa
L. argenteus var. argentatus, L. argenteus var. argenteus, L. argenteus var. argophyllus, L. argenteus var. fulvomaculatus, L. argenteus var. heteranthus, L. argenteus var. hillii, L. argenteus var. meionanthus, L. argenteus var. moabensis, L. argenteus var. montigenus, L. argenteus var. palmeri, L. argenteus var. parviflorus, L. argenteus var. rubricaulis, L. argenteus var. utahensis
Synonyms L. uncialis var. cryptanthus
Name authority Pursh: Fl. Amer. Sept. 2: 468. (1814) S. Watson: Botany (Fortieth Parallel), 54, plate 7, figs. 5–10. (1871)
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