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freckled milkvetch, Mount Trumbull milkvetch

Habit Plants perennial, 30–45(–65) cm, herbage green or subglabrescent. Herbs annual, biennial, or perennial, caulescent or subacaulescent; caudex superficial or subterranean.
Stems

single or few to many.

Leaves

2–9.5(–10.5) cm;

leaflets (7–)13–17, blades broadly obovate to oblanceolate or elliptic, 5–15 mm, apex retuse to round or subacute, adaxial surface usually strigose to strigulose, sometimes glabrate or glabrous.

odd-pinnate, petiolate to subsessile;

leaflets (3–)7–27(or 29).

Racemes

loosely 4–15(–17)-flowered;

axis elongating, 3–9.5 cm in fruit.

loosely or remotely flowered or subumbellate, flowers ascending to spreading or declined.

Peduncles

4.5–7.5 cm.

Flowers

13–17 mm;

calyx 6.3–7.4 mm, tube 4.8–5.5 mm, lobes 1.7–2 mm;

corolla pink- or red-purple, sometimes with pale or white wing tips.

Corollas

usually white, lilac, purple, or pink- to magenta-purple, lavender, or violet, sometimes ochroleucous or yellowish, keel apex usually purple, banner recurved through 30–50°, keel apex round, obtuse, or bluntly deltate.

Calyx

tubes cylindric or campanulate.

Legumes

evidently persistent, stramineous or mottled, linear-oblong to oblong or narrowly ellipsoid, not or scarcely inflated, 17–32 × 4–5.5(–7.5) mm, ± bilocular, somewhat fleshy becoming leathery or stiffly papery, strigulose;

beak 3–5 mm, unilocular;

stipe 0.1–1 mm.

usually deciduous, sometimes persistent, usually sessile, rarely short-stipitate, ascending, spreading, deflexed, or declined, linear, narrowly lanceoloid to oblanceoloid or ellipsoid, oblong, ovoid to obovoid, subglobose, or triangular-obcordate, ventral suture deeply grooved and appearing ± didymous, strongly inflated, terete, dorsiventrally compressed, or 3-sided compressed, straight or curved, usually bilocular, sometimes semibilocular or unilocular.

Seeds

14–28.

(7–)10–42.

Hairs

basifixed.

Stipules

distinct.

Astragalus lentiginosus var. trumbullensis

Astragalus sect. Diphysi

Phenology Flowering Apr (Sep).
Habitat Sandstone outcrops and gravel, with Agave, Ephedra, Mortonia, Purshia, and other warm-desert shrubs.
Elevation 900–1800 m. (3000–5900 ft.)
Distribution
from FNA
AZ
[BONAP county map]
w North America; nw Mexico
Discussion

Variety trumbullensis is restricted to Mohave County. It is closely related to vars. mokiacensis and palans, weakly differentiated by a series of features that intergrade insensibly but taken in combination are more or less diagnostic (as is true for most members of the lentiginosus complex). J. A. Alexander (2005) provided statistical evidence that this variety is indistinguishable from var. mokiacensis (as Astragalus mokiacensis), and he considered the two synonymous.

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

Species 3 (3 in the flora).

Section Diphysi has wide distribution in western North America, from British Columbia southward to northwestern Mexico. One of the species, Astragalus lentiginosus, consists of 42 varieties and is as complex an assemblage as occurs in many genera.

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

Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Astragalus > sect. Diphysi > Astragalus lentiginosus Fabaceae > subfam. Faboideae > Astragalus
Sibling taxa
A. lentiginosus var. albifolius, A. lentiginosus var. ambiguus, A. lentiginosus var. antonius, A. lentiginosus var. australis, A. lentiginosus var. chartaceus, A. lentiginosus var. coachellae, A. lentiginosus var. coulteri, A. lentiginosus var. diphysus, A. lentiginosus var. floribundus, A. lentiginosus var. fremontii, A. lentiginosus var. higginsii, A. lentiginosus var. idriensis, A. lentiginosus var. ineptus, A. lentiginosus var. kennedyi, A. lentiginosus var. kernensis, A. lentiginosus var. latus, A. lentiginosus var. lentiginosus, A. lentiginosus var. macrolobus, A. lentiginosus var. maricopae, A. lentiginosus var. micans, A. lentiginosus var. mokiacensis, A. lentiginosus var. multiracemosus, A. lentiginosus var. negundo, A. lentiginosus var. nigricalycis, A. lentiginosus var. oropedii, A. lentiginosus var. palans, A. lentiginosus var. piscinensis, A. lentiginosus var. platyphyllidius, A. lentiginosus var. pohlii, A. lentiginosus var. salinus, A. lentiginosus var. scorpionis, A. lentiginosus var. semotus, A. lentiginosus var. sesquimetralis, A. lentiginosus var. sierrae, A. lentiginosus var. stramineus, A. lentiginosus var. toyabensis, A. lentiginosus var. variabilis, A. lentiginosus var. vitreus, A. lentiginosus var. wahweapensis, A. lentiginosus var. wilsonii, A. lentiginosus var. yuccanus
Subordinate taxa
Name authority S. L. Welsh & N. D. Atwood: Rhodora 103: 81, fig. 3. (2001) A. Gray: Proc. Amer. Acad. Arts 6: 192. (1864)
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