Erlangea
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Ordo: Asterales
Familia: Asteraceae
Name
Erlangea Sch. Bip., 1853 – Wikispecies link – Pensoft Profile
- Erlangea Sch. Bip., 1853, Flora 36: 34. 1853. – Type: Erlangea plumosa Sch. Bip.
Resources
Species treatment based on Wild and Pope 1977[1].
Descriptions
Annual or short-lived perennial herbs; stems erect, branching near base; hairs on vegetative parts simple, uniseriate, multicellular, with a straight elongate apical cell. Leaves alternate, sessile or subsessile, pinnately veined with weak secondary veins, margins serrulate, apices obtuse. Inflorescence with single terminal head or laxly cymiform with narrowly pedunculate heads. Heads campanulate; involucral bracts 45–60 in 3–4 series, gradate, cuspidate apically, with distinct pale or reddish lateral margins, pilose to lanulose outside; receptacle convex, epaleaceous, with glabrous reticulum. Florets 50–75 or more in a head; corollas reddish, funnelform, with slender basal tube bearing small stipitate glands, throat shorter than lobes, lobes linear-lanceolate, with stiff hairs distally or apically; anther thecae short-acute with small sterile margin at base; apical appendage, oblong-ovate, glabrous, with thin cell walls; style base with narrow annuliform sclerified node; sweeping hairs acicular, at lowest level scarcely extending to top of shaft. Achenes shortly obconic, abruptly narrowed distally to insertion of corolla, 3-6-ribbed, setulae restricted mostly to broad ribs, setulae not split at tips, sides with scattered isolated idioblasts, raphids subquadrate or short oblong in dense inner layer of short to quadrate cells in achene wall; pappus of less than 20 easily deciduous barbellate bristles, bases narrow and weakly attached, distinct outer series not evident. Chromosome number n = 10 (Turner and Lewis 1965[2], Nordenstam 1967[3]).
Pollen ca. 47 μm in diameter in fluid, lophate, triporate, with group of polar lacunae, perforated tectum restricted to muri, bacculae centered at junctures of muri, leaving ogee-shaped gaps under the centers of the muri (Figs 8 A–C). Notable secondary metabolites, eudesmanolide sesquiterpene lactones, Bohlmann and Jakupovic 1990[4], as Erlangea remifolia Wild & Pope).
Taxon Treatment
- Robinson, H; Skvarla, J; Funk, V; 2016: Vernonieae (Asteraceae) of southern Africa: A generic disposition of the species and a study of their pollen PhytoKeys, (60): 49-126. doi
Images
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Other References
- ↑ Wild H, Pope G (1977) The compositae of the Flora Zambesiaca area. Vernonieae (excluding Vernonia Schreb.). Kirkia 10: 339–384.
- ↑ Turner B, Lewis W (1965) Chromosome numbers in the Compositae: African species. Journal of South African Botany 31: 207–217.
- ↑ Nordenstam B (1967) Chromosome numbers in South African Compositae. Aquilo, Ser. Botanica 6: 219–227.
- ↑ Bohlmann F, Jakupovic J (1990) Progress in the chemistry of the Vernonieae (Compositae). Plant Systematics and Evolution Suppl. 4: 3–43. doi: 10.1007/978-3-7091-6928-5_2
