Difference between revisions of "Dodecahema"
Phytologia 66: 86. 1989.
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|common_names=Spinyherb | |common_names=Spinyherb | ||
| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Centrostegia sect. Diplostegia | |name=Centrostegia sect. Diplostegia | ||
|authority=Roberty & Vautier | |authority=Roberty & Vautier | ||
| + | |rank=section | ||
| + | |publication_title=Boissiera | ||
| + | |publication_place=10: 91. 1964 | ||
}} | }} | ||
|synonyms= | |synonyms= | ||
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|distribution=Calif. | |distribution=Calif. | ||
|discussion=<p>Species 1.</p><!-- | |discussion=<p>Species 1.</p><!-- | ||
| − | --><p>Each of the 12 awns on each involucre of Dodecahema leptoceras is long and slender. They are more like those seen in Sidotheca (Eriogonineae) than those of any member of the Chorizanthineae. J. L. Reveal and C. B. Hardham (1989) reported a consistent chromosome count of n = 15 plus (seemingly) additional chromosome fragments that bring the number to approximately n = 17. More work is required to resolve the exact chromosome number for the species. A specimen (Meiere s.n., 4 May 1917, CAS) supposedly from Needles, San Bernardino County, is discounted.</p> | + | --><p>Each of the 12 awns on each involucre of <i>Dodecahema leptoceras</i> is long and slender. They are more like those seen in <i>Sidotheca</i> (Eriogonineae) than those of any member of the Chorizanthineae. J. L. Reveal and C. B. Hardham (1989) reported a consistent chromosome count of n = 15 plus (seemingly) additional chromosome fragments that bring the number to approximately n = 17. More work is required to resolve the exact chromosome number for the species. A specimen (Meiere s.n., 4 May 1917, CAS) supposedly from Needles, San Bernardino County, is discounted.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1989 | |publication year=1989 | ||
|special status= | |special status= | ||
| − | |source xml=https:// | + | |source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V5/V5_995.xml |
|subfamily=Polygonaceae subfam. Eriogonoideae | |subfamily=Polygonaceae subfam. Eriogonoideae | ||
|genus=Dodecahema | |genus=Dodecahema | ||
Latest revision as of 22:15, 5 November 2020
Herbs, annual; taproot slender. Stems arising directly from the root, spreading, solid, not fistulose or disarticulating into ringlike segments, sparsely glandular. Leaves usually quickly deciduous, basal, rosulate; petiole present; blade narrowly oblanceolate, margins entire. Inflorescences terminal, cymose, uniparous due to suppression of secondaries; branches dichotomous, not brittle or disarticulating into segments, round, sparsely glandular; bracts 3–4, positioned to side and opposite next distal subsequent branch or involucre, connate ca. 1/2 their length, lanceolate, awned, sparsely glandular. Peduncles spreading, peglike. Involucres 1 per node, tubular, cylindric, 6-angled; teeth 6, awn-tipped, awns uncinate. Flowers 3 per involucre; perianth white to pink, campanulate when open, cylindric when closed, pubescent abaxially; tepals 6, connate proximally, monomorphic, entire apically; stamens 9; filaments free, glabrous; anthers red to maroon, oblong. Achenes included, dark brown to black, not winged, 3-gonous, glabrous. Seeds: embryo curved. x = ca. 17.
Discussion
Species 1.
Each of the 12 awns on each involucre of Dodecahema leptoceras is long and slender. They are more like those seen in Sidotheca (Eriogonineae) than those of any member of the Chorizanthineae. J. L. Reveal and C. B. Hardham (1989) reported a consistent chromosome count of n = 15 plus (seemingly) additional chromosome fragments that bring the number to approximately n = 17. More work is required to resolve the exact chromosome number for the species. A specimen (Meiere s.n., 4 May 1917, CAS) supposedly from Needles, San Bernardino County, is discounted.
Selected References
None.