Difference between revisions of "Asclepias sanjuanensis"
J. M. Porter & S. L. Welsh, Great Basin Naturalist 49: 100, fig. 1. 1989.
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|species=Asclepias sanjuanensis | |species=Asclepias sanjuanensis | ||
Latest revision as of 13:13, 24 November 2024
Herbs. Stems 1–8, decumbent, unbranched or branched near base, 4–13 cm, densely puberulent with curved trichomes, not glaucous, rhizomatous. Leaves opposite and alternate, petiolate, with 0 or 1 stipular colleter on either side of petiole; petiole 2–5 mm, margins puberulent with curved trichomes; blade lanceolate to ovate, 2–5 × 0.5–2 cm, chartaceous, base obtuse to cuneate, margins entire, apex acute to attenuate, venation eucamptodromous, surfaces sparsely pilosulous to glabrate, persistent on veins, margins densely ciliate, laminar colleters absent. Inflorescences terminal and extra-axillary at upper nodes, sessile, 3–8-flowered, bracts few. Pedicels 11–24 mm, densely pilosulous. Flowers erect; calyx lobes elliptic, 2–2.5 mm, apex acute, pilose; corolla red-violet, lobes reflexed with spreading tips, oval, 4–5 mm, apex acute, glabrous; gynostegial column 0.2–0.5 mm; fused anthers brown, cylindric, 1.5–2 mm, wings narrowly right-triangular, apical appendages ovate, erose; corona segments red-violet dorsally, white to orange proximally, sessile, cupulate, 1.5–2 mm, slightly exceeded by style apex, apex truncate with a proximal tooth on each side, glabrous, internal appendage falcate, barely exserted from cavity, glabrous; style apex shallowly depressed, pink to red-violet. Follicles erect on upcurved pedicels, ovoid, 3–5 × 0.7–1 cm, apex acuminate, smooth, pilosulous to tomentulose. Seeds broadly ovate, 8–9 × 6–7 mm, margin winged, erose, faces densely rugulose, lepidote; coma 1–1.5 cm.
Phenology: Flowering Apr–May; fruiting May–Jun.
Habitat: Slopes, ridges, arroyos, sandstone, sandy, silty, and rocky soils, juniper and pinyon-juniper woodlands, shrubby grasslands, desert scrub.
Elevation: 1400–1800 m.
Distribution
Ariz., N.Mex., Utah.
Discussion
As discussed under Asclepias eastwoodiana, A. sanjuanensis is part of a complex of four species sometimes recognized as a single species. The range of A. sanjuanensis is larger than initially realized, extending across northwestern Arizona (Apache and Navajo counties) and barely entering southeastern Utah (San Juan County), as discussed under A. ruthiae. These two species are completely allopatric. In New Mexico, A. sanjuanensis is restricted to San Juan County.
Selected References
None.