Difference between revisions of "Prenanthella"
Bull. Torrey Bot. Club 33: 160. 1906.
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--><p>The single species of <i>Prenanthella</i> was usually assigned to <i>Lygodesmia</i> in treatments prior to A. S. Tomb’s (1972b) reassessment. Its base chromosome number of x = 7 was taken as evidence of a possible relationship with <i>Malacothrix</i>, <i>Calycoseris</i>, and <i>Anisocoma</i>, also x = 7 (Tomb 1974). Recent molecular phylogenetic studies (J. Lee et al. 2003) place <i>Prenanthella</i> in a clade with <i>Pleiacanthus</i>, <i>Stephanomeria</i>, and <i>Rafinesquia</i>, all with x = 8. This group, together with <i>Munzothamnus</i>, constitutes the subtribe Stephanomeriinae of Lee and B. G. Baldwin (2004).</p> | --><p>The single species of <i>Prenanthella</i> was usually assigned to <i>Lygodesmia</i> in treatments prior to A. S. Tomb’s (1972b) reassessment. Its base chromosome number of x = 7 was taken as evidence of a possible relationship with <i>Malacothrix</i>, <i>Calycoseris</i>, and <i>Anisocoma</i>, also x = 7 (Tomb 1974). Recent molecular phylogenetic studies (J. Lee et al. 2003) place <i>Prenanthella</i> in a clade with <i>Pleiacanthus</i>, <i>Stephanomeria</i>, and <i>Rafinesquia</i>, all with x = 8. This group, together with <i>Munzothamnus</i>, constitutes the subtribe Stephanomeriinae of Lee and B. G. Baldwin (2004).</p> | ||
|tables= | |tables= | ||
| − | |references= | + | |references={{Treatment/Reference |
| + | |id=tomb1972a | ||
| + | |text=Tomb, A. S. 1972b. Re-establishment of the genus Prenanthella Rydb. (Compositae: Cichorieae). Brittonia 24: 223–228. | ||
| + | }} | ||
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|illustration copyright=Flora of North America Association | |illustration copyright=Flora of North America Association | ||
|distribution=sw United States;nw Mexico. | |distribution=sw United States;nw Mexico. | ||
| − | |reference= | + | |reference=tomb1972a |
|publication title=Bull. Torrey Bot. Club | |publication title=Bull. Torrey Bot. Club | ||
|publication year=1906 | |publication year=1906 | ||
|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/V19-20-21/V19_570.xml |
|tribe=Asteraceae tribe Cichorieae | |tribe=Asteraceae tribe Cichorieae | ||
|genus=Prenanthella | |genus=Prenanthella | ||
Revision as of 20:18, 16 December 2019
Annuals, 5–30 cm; taprooted. Stems 1–5+, erect (leafy proximally, often flexuous distally), branched near base bases or distally, glandular-puberulent to glabrescent. Leaves basal or proximally cauline; sessile or petiolate; blades spatulate to oblanceolate, often runcinate, margins irregularly dentate to lobed, teeth often spinulose (faces glabrous). Heads (10–150+, on flexuous, bracteate, intricately-branched axes) in paniculiform arrays. Peduncles not inflated, minutely bracteate. Calyculi of 2–3, minute, deltate, unequal bractlets. Involucres ovoid, cylindric at flowering, 2–3 mm diam. Phyllaries 3–5 in 1 series, linear-lanceolate, equal, herbaceous, margins hyaline, apices acute. Receptacles flat, smooth (with scars), glabrous, epaleate. Florets 3–4; corollas pink or white (slightly surpassing phyllaries at flowering). Cypselae pale brown, columnar, tapering slightly proximally, not beaked, 5-ribbed and grooved, minutely rugulose, glabrous; pappi tardily falling, of 80+, basally connate, white, unequal, stiff, smooth bristles. x = 7.
Distribution
sw United States, nw Mexico.
Discussion
Species 1.
The single species of Prenanthella was usually assigned to Lygodesmia in treatments prior to A. S. Tomb’s (1972b) reassessment. Its base chromosome number of x = 7 was taken as evidence of a possible relationship with Malacothrix, Calycoseris, and Anisocoma, also x = 7 (Tomb 1974). Recent molecular phylogenetic studies (J. Lee et al. 2003) place Prenanthella in a clade with Pleiacanthus, Stephanomeria, and Rafinesquia, all with x = 8. This group, together with Munzothamnus, constitutes the subtribe Stephanomeriinae of Lee and B. G. Baldwin (2004).