View source for Asclepias sanjuanensis

{{Treatment/ID
|accepted_name=Asclepias sanjuanensis
|accepted_authority=K. D. Heil
|publications={{Treatment/Publication
|title=J. M. Porter & S. L. Welsh, Great Basin Naturalist
|place=49: 100, fig. 1. 1989
|year=1989
}}
|common_names=San Juan milkweed
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms=
|hierarchy=Apocynaceae;Asclepias;Asclepias sanjuanensis
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Apocynaceae]]</div><div class="higher-taxon"><small>genus</small>[[Asclepias]]</div><div class="higher-taxon"><small>species</small>[[Asclepias sanjuanensis]]</div></div>
|volume=Volume 14
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs.</b> Stems 1–8, decumbent, unbranched or branched near base, 4–13 cm, densely puberulent with curved trichomes, not glaucous, rhizomatous. <b>Leaves</b> 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. <b>Inflorescences</b> terminal and extra-axillary at upper nodes, sessile, 3–8-flowered, bracts few. <b>Pedicels</b> 11–24 mm, densely pilosulous. <b>Flowers</b> 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. <b>Follicles</b> erect on upcurved pedicels, ovoid, 3–5 × 0.7–1 cm, apex acuminate, smooth, pilosulous to tomentulose. <b>Seeds</b> broadly ovate, 8–9 × 6–7 mm, margin winged, erose, faces densely rugulose, lepidote; coma 1–1.5 cm.</span><!--

-->{{Treatment/Body
|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=<p>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.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Asclepias sanjuanensis
|authority=K. D. Heil
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Apocynaceae
|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.
|reference=None
|publication title=J. M. Porter & S. L. Welsh, Great Basin Naturalist
|publication year=1989
|special status=Endemic
|source xml=
|genus=Asclepias
|species=Asclepias sanjuanensis
}}<!--

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