Difference between revisions of "Pentzia"
Prodr. Pl. Cap., 145. 1800.
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|distribution=Africa (mostly South Africa;also Namibia and Mediterranean Africa and adjacent areas). | |distribution=Africa (mostly South Africa;also Namibia and Mediterranean Africa and adjacent areas). | ||
+ | |introduced=true | ||
|discussion=<p>Species ± 23 (1 in the flora).</p> | |discussion=<p>Species ± 23 (1 in the flora).</p> | ||
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|publication year=1800 | |publication year=1800 | ||
|special status= | |special status= | ||
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|tribe=Asteraceae tribe Anthemideae | |tribe=Asteraceae tribe Anthemideae | ||
|genus=Pentzia | |genus=Pentzia |
Latest revision as of 20:57, 5 November 2020
Shrubs [subshrubs], [5–]15–35[–50] cm (usually aromatic). Stems 1–10+, usually much branched, ± tomentose (hairs medifixed) [glabrate or glabrous]. Leaves cauline (often fascicled, ± ericoid); alternate [opposite]; petiolate or sessile; blades linear to obovate or cuneate, often 1[–2]-pinnately lobed, ultimate margins entire or toothed, faces ± tomentose [glabrate or glabrous]. Heads discoid, borne singly or in loose, corymbiform arrays (pedunculate). Involucres spheric to hemispheric or broader, 3–6[–12+] mm diam. Phyllaries persistent or tardily falling, 22–40[–60+] in 3–4+ series, distinct, deltate-ovate to elliptic or obovate (sometimes each with central resin canal and/or keel), unequal, margins and apices (often hyaline, sometimes brownish) ± scarious (tips of inner ± dilated). Receptacles conic [convex to hemispheric], epaleate. Ray florets 0. Disc florets 40–100[–200+], bisexual, fertile; corollas yellow, tubes ± cylindric (usually dilated, with relatively thick vascular strands), throats abruptly dilated, lobes 5, triangular. Cypselae narrowly obovoid to oblong or elliptic, ± terete or flattened, ribs 5, faces gland-dotted between ribs (pericarps with myxogenic cells abaxially and along ribs); pappi of 1 (often cupped or earlike) or 3–5 (erose to lacerate) scales (usually more developed adaxially) [asymmetrically coroniform or 0]. x = 9.
Distribution
Introduced; Africa (mostly South Africa, also Namibia and Mediterranean Africa and adjacent areas).
Discussion
Species ± 23 (1 in the flora).
Selected References
None.