Difference between revisions of "Thelocactus bicolor"
Bull. Torrey Bot. Clu b 49: 251. 1922.
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|common_names=Glory-of-Texas;Texas pride | |common_names=Glory-of-Texas;Texas pride | ||
| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Echinocactus bicolor | |name=Echinocactus bicolor | ||
|authority=Galeotti ex Pfeiffer | |authority=Galeotti ex Pfeiffer | ||
| + | |publication_title=in L. K. G. Pfeiffer and C. F. Otto, Abbild. Beschr. Cact. | ||
| + | |publication_place=2: plate 25. 1848 | ||
}} | }} | ||
|synonyms= | |synonyms= | ||
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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/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V4/V4_406.xml |
|subfamily=Cactaceae subfam. Cactoideae | |subfamily=Cactaceae subfam. Cactoideae | ||
|genus=Thelocactus | |genus=Thelocactus | ||
Revision as of 20:00, 24 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 |