Hilliardiella
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Ordo: Asterales
Familia: Asteraceae
Name
Hilliardiella H. Rob., 1999 – Wikispecies link – Pensoft Profile
- Hilliardiella H. Rob. Proc. Biol. Soc. Wash. 112(1): 247. 1999. – Type: Vernonia pinifolia (Lam.) Less.
- Webbia DC., Prodr. 5: 72. Oct 1836, nom. illeg., not Webbia Spach, Jun 1836.
- Vernonia subsect. Hilliardianae S.B. Jones, Rhodora 83: 66. 1981. – Type: Vernonia oligocephala (DC.) Sch. Bip.
Descriptions
Herbaceous perennials to 1 m tall; stems pilose, hairs unequally T-shaped. Leaves alternate; blades abaxially often densely canescent pilose. Inflorescence laxly to subdensely corymbiform-cymose. Heads short-pedunculate; involucres campanulate, bracts 25–40, in ca. 3–4 series, persistent; receptacle epaleaceous. Florets 12–20 in a head; corollas purple, outside with few to many slightly contorted T-shaped hairs; basal tube funneliform above, throat short, lobes linear; anther thecae not or shortly appendaged at base; apical appendages glabrous, with thin walls; style with basal node; style branches with acicular sweeping hairs. Achenes 4–5-costate, densely setuliferous, setulae scarcely divided at tips, idioblasts numerous, raphids elongate, carpopodia narrowly cylindrical; pappus bristles white, barbate, tenuous, subpersistent, outer series shortly lanceolate. Chromosome number of n = 9, 10, most reports n = 10 (Turner and Lewis 1965[1]; Jones 1982[2]).
Pollen grains sublophate, with continuous perforated tectum between colpi, tricolporate to poles, echinate (Fig. 14 A–H). Notable secondary metabolites; acetones & sesquiterpene glaucolides/ hirsutanolides (Bohlmann and Jakupovic (1990[3], as Vernonia sutherlandii Harv., guaianolides, bisabolene derivatives (Bohlmann and Jakupovic 1990[3], as Vernonia hirsuta Sch. Bip. ex Walp. and Vernonia oligocephala (DC.) Sch. Bip. ex Walp.).
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
- ↑ Turner B, Lewis W (1965) Chromosome numbers in the Compositae: African species. Journal of South African Botany 31: 207–217.
- ↑ Jones S (1982) Pp. 126–127 In: Löve A (Ed.) IOPB Chromosome number reports LXXIV. Taxon 31: 119–128. http://www.jstor.org/stable/1219710?seq=1#page_scan_tab_contents
- ↑ 3.0 3.1 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
