Difference between revisions of "Eriogonum twisselmannii"
in P. A. Munz, Suppl. Calif. Fl. 40. 1968.
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|name=Eriogonum douglasii var. twisselmannii | |name=Eriogonum douglasii var. twisselmannii | ||
|authority=J. T. Howell | |authority=J. T. Howell | ||
+ | |rank=variety | ||
|publication_title=Leafl. W. Bot. | |publication_title=Leafl. W. Bot. | ||
|publication_place=10: 13. 1963 | |publication_place=10: 13. 1963 | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Eriogonum twisselmannii | name=Eriogonum twisselmannii | ||
− | |||
|authority=(J. T. Howell) Reveal in P. A. Munz | |authority=(J. T. Howell) Reveal in P. A. Munz | ||
|rank=species | |rank=species | ||
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|publication year=1968 | |publication year=1968 | ||
|special status= | |special status= | ||
− | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V5/V5_745.xml |
|subfamily=Polygonaceae subfam. Eriogonoideae | |subfamily=Polygonaceae subfam. Eriogonoideae | ||
|genus=Eriogonum | |genus=Eriogonum |
Revision as of 22:56, 16 December 2019
Herbs, matted, occasionally polygamodioecious, (0.2–)0.5–1.5 × 3–4 dm, tomentose. Stems: caudex spreading; aerial flowering stems erect or nearly so, slender, solid, not fistulose, arising at nodes of caudex branches and at distal nodes of short, nonflowering aerial branches, (0.2–)0.5–1.2 dm, tomentose, with a whorl of 4–8 leaflike bracts ca. midlength, similar to leaf blades, 0.4–0.8 × 0.1–0.3 cm. Leaves in loose to congested basal rosettes; petiole 0.2–0.4 cm, thinly tomentose; blade oblanceolate to elliptic, 0.5–1 × (0.2–)0.4–0.6 cm, white- or grayish-tomentose abaxially, thinly tomentose to nearly glabrous and dull green adaxially. Inflorescences capitate, 0.7–1.5 cm wide; branches absent; bracts absent immediately below involucre. Involucres 1 per node, campanulate, (2.5–)4–5 × 4–6 mm; teeth 6–9, lobelike, strongly reflexed, (2–)3–5 mm. Flowers (4–)5–6 mm, including 1–1.3 mm stipelike base; perianth pale yellow, villous abaxially; tepals slightly dimorphic, those of outer whorl obtuse, 3–5 × 3–3.5 mm, those of inner whorl broadly oblanceolate, 5–6 × 2.5–3 mm; stamens exserted, 4–5 mm; filaments pilose proximally. Achenes light brown, 5–5.5 mm, glabrous except for sparsely pubescent beak.
Phenology: Flowering Jun–Sep.
Habitat: Rocky outcrops, montane conifer woodlands
Elevation: 2300-2600 m
Discussion
Of conservation concern.
Eriogonum twisselmannii is a rare species of the southern Sierra Nevada and is known only from Slate Mountain and The Needles in Tulare County. It is worthy of being on a “watch” list of rare plants in California, but because of its remote location, it is not threatened.
Selected References
None.