Astragalus lentiginosus var. wahweapensis |
Astragalus lentiginosus var. trumbullensis |
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wahweap freckled milkvetch |
freckled milkvetch, Mount Trumbull milkvetch |
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Habit | Plants perennial (short-lived, sometimes flowering first year), 10–25(–35) cm. | Plants perennial, 30–45(–65) cm, herbage green or subglabrescent. |
Stems | diffuse and incurved-ascending. |
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Leaves | (2.5–)4–11 cm; leaflets 13–23, blades elliptic-oblanceolate, broadly oblong-oblanceolate, or obovate, (3–)5–17(–20) mm, apex obtuse or emarginate. |
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. |
Racemes | 10–20-flowered, flowering from middle and distally, compact to loose in fruit; axis 1.5–5.5(–7) cm in fruit. |
loosely 4–15(–17)-flowered; axis elongating, 3–9.5 cm in fruit. |
Peduncles | 2.5–6(–7.5) cm. |
4.5–7.5 cm. |
Flowers | (12.5–)15–18.2 mm; calyx (6.2–)7.5–10.5 mm, tube (4.6–)5.2–6.7 mm, lobes 1.4–3.8 mm; corolla usually bright pink-purple with pale, striate eye, rarely white (concolorous). |
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. |
Legumes | green, sometimes stramineous or purple-mottled, almost always very strongly incurved, very obliquely ovoid-acuminate, moderately or greatly inflated, 15–30(–40) × (7–)9–15 mm, bilocular, thinly papery, semitranslucent, seeds visible, to almost leathery, opaque, usually glabrous, rarely puberulent; beak well-defined, triangular or deltoid, 6–15 mm, unilocular. |
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. |
Seeds | (20–)24–28. |
14–28. |
Astragalus lentiginosus var. wahweapensis |
Astragalus lentiginosus var. trumbullensis |
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Phenology | Flowering Apr–Jul. | Flowering Apr (Sep). |
Habitat | Pinyon-juniper, sagebrush, and mixed desert shrub communities. | Sandstone outcrops and gravel, with Agave, Ephedra, Mortonia, Purshia, and other warm-desert shrubs. |
Elevation | 1400–1900 m. (4600–6200 ft.) | 900–1800 m. (3000–5900 ft.) |
Distribution |
AZ; UT |
AZ |
Discussion | Variety wahweapensis may be very abundant in wetter years, filling the interspaces in pinyon-juniper woodland much like an alfalfa field. It is found on the plateaus and drainages affluent to Lake Powell in eastern Kane and Garfield counties in Utah, and in northern Arizona. Variety wahweapensis grades into the slender-podded var. palans to the east and the ovoid-fruited var. diphysus southward. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Name authority | S. L. Welsh: Great Basin Naturalist 38: 286. (1978) | S. L. Welsh & N. D. Atwood: Rhodora 103: 81, fig. 3. (2001) |
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