Difference between revisions of "Thelocactus bicolor"
Bull. Torrey Bot. Clu b 49: 251. 1922.
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|distribution=Tex.;Mexico. | |distribution=Tex.;Mexico. | ||
|discussion=<p>Varieties ca. 4 (2 in the flora).</p><!-- | |discussion=<p>Varieties ca. 4 (2 in the flora).</p><!-- | ||
| − | --><p>Thelocactus bicolor varies geographically, and an indefinite number of segregate taxa may deserve recognition in Mexico.</p> | + | --><p><i>Thelocactus bicolor</i> varies geographically, and an indefinite number of segregate taxa may deserve recognition in Mexico.</p> |
|tables= | |tables= | ||
|references= | |references= | ||
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|publication year=1922 | |publication year=1922 | ||
|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/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V4/V4_406.xml |
|subfamily=Cactaceae subfam. Cactoideae | |subfamily=Cactaceae subfam. Cactoideae | ||
|genus=Thelocactus | |genus=Thelocactus | ||
Revision as of 18:28, 18 September 2019
Stems 3–38 × (2–)4–10(–18) cm; ribs 8–13 (plant often reaching sexual maturity while still entirely tuberculate); areoles spaced 6–20 mm apart along ribs. Spines (8–)12–30 per areole; radial spines (8–)12–20(–27) per areole, straw colored or white, contrasting with all other spines, 9–35(–45) × 0.3–1 mm, adaxial 1–3+ spines of areole strongly flattened, bladelike or ribbonlike, to 4 times wider than thick, 16–75(–100) mm (usually absent from sexually immature plants); central spines (9–)13–42(–58) × (0.2–)0.4–1.5 mm. Flowers: inner tepals rose-pink to magenta, marked with scarlet or orange proximally, sometimes with white band or margins near bases; stigma lobes reddish to red-orange or pale reddish brown or yellowish. Seeds finely papillate with strongly convex testa cells. 2n = 22.
Distribution
Tex., Mexico.
Discussion
Varieties ca. 4 (2 in the flora).
Thelocactus bicolor varies geographically, and an indefinite number of segregate taxa may deserve recognition in Mexico.
Selected References
None.
Key
| 1 | Areoles and spines larger; spines red and white, (older spines weather to ashy white), yellow color-form absent; widespread in s Texas and Big Bend region | Thelocactus bicolor var. bicolor |
| 1 | Areoles and spines smaller; spines usually yellow (rarely red, 0-5% in all populations); only in Marathon Basin of n Brewster County, Texas | Thelocactus bicolor var. flavidispinus |