Ethulia\according to Robinson et al 2016
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Ordo: Asterales
Familia: Asteraceae
Name
Ethulia L.f. – Wikispecies link – Pensoft Profile
- Ethulia L.f. Dec. Prima Pl. Rar. Horti Upsal. 1 (1762); L.f. ex L., Sp. Pl. ed. II: 1171 (1763). – Type: Ethulia conyzoides L.f.
- Hoehnelia Schweinf. in Höhnel, Zum Rudolf-See und Stephanie-See 86 (1892). – Type: Hoehnelia vernonioides Schweinf. in Höhnel.
Resources
Treatment of the genus by Gilbert and Jeffrey (1988)[1].
Descriptions
Annual or short-lived perennial herbs, rarely rhizomatous; stems terete and usually striate, with broad solid pith; hairs uniseriate with erect apical cells, with glandular dots. Leaves alternate, sessile or short petiolate; blades thinly herbaceous, ovate to linear lanceolate, base cuneate or continuous onto stem, margins subentire to serrate or dentate, apex acute to obtuse, surfaces glabrous to densely pubescent; venation pinnate with ascending secondary veins. Inflorescence terminal, corymbiform to rather cymiform, lower bracteoles a reduced foliiform, peduncular bracteoles filiform. Heads rather small, with broadly campanulate involucres; involucral bracts 15–40 in 2–3 usually subequal series; receptacle flat or slightly convex, epaleaceous. Florets 3–100 in a head, strongly exserted; corollas white or pink to purple, with glandular dots on surface, with a narrow cylindrical base, limb narrowly funnelform to narrowly campanulate; lobes lanceolate, without apical hairs; bases of anther thecae rounded, not tailed; apical appendages glabrous; style base without node; branches with sweeping hairs shortly acute. Achenes cylindrical with 2–6 usually paler ribs, sides with glandular dots, rarely with short white setulae; raphids short-oblong; pappus lacking or a coroniform rim. Chromosome number n = 10, 20 (Pilz 1980[2]; Gilbert and Jeffrey 1988[1]).
Pollen: ca. 35 μm in diam. in fluid; tricolporate, sublophate, echinate, spines long; tectum continuous in intercolpi and at poles, distinctly microperforate; columellae below spines firmly attached to footlayer (Fig. 8 D–F).
Notable secondary metabolites: 5-alkylcoumarins (Bohlmann and Jakupovic 1990[3], as Ethulia conyzoides).
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
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Other References
- ↑ 1.0 1.1 Gilbert M, Jeffrey C (1988) A revision of Ethulia (Compositae: Vernonieae). Kew Bulletin 43(2): 165–193. doi: 10.2307/4113733
- ↑ Pilz G (1980) Pp. 352–354 In: Löve A (Ed.) IOPB Chromosome number reports LXVII. Taxon 29: 347–367.
- ↑ 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
