Description [ edit ]
The leaves have an alternate arrangement, The leaf shape is lanceolate to ovate. The leaf margins are entire or dentate. The leaves are sessile in L. hypoleuca, but petiolate in L. serpentina. The leaves are glabrous above, but underneath thick with white hairs, giving it a silvery appearance. Hence its common name : silverback.
At the end of each stem there is an inflorescence with generally 4-12, flat-topped clustered flower heads. These are discoid, i.e. they contain only disc flowers and lack the ray flowers. The bracts under the flower head occur in 1-2 equal series. The receptacle is flat or convex. There are generally 11-23 bright yellow disc flowers, with a slightly expanded throat.
- Luina hypoleucaBenth. : Silverback Luina, Littleleaf Luina - British Columbia, Washington, Oregon, California (Lake Co to Del Norte Co)
- Luina hypoleuca var. californica A.Gray
- Luina hypoleuca var. dentata L.F.Hend.
- Luina hypoleuca var. hypoleuca
- Luina serpentinaCronquist : Colonial Luina, Creeping Silverback - Grant County in Oregon
- formerly included
- Luina nardosmia(A.Gray) Cronquist - Cacaliopsis nardosmia (A.Gray) A.Gray
- Luina stricta(Greene) B.L.Rob. - Prenanthes stricta Greene
References [ edit ]
- Flann, C (ed) 2009+ Global Compositae Checklist Archived 2014-12-17 at Archive.today
- Bentham, George. 1873. Hooker's Icones Plantarum 12: 35-36 descriptions in Latin, commentary in English
- Bentham, George. 1873. Hooker's Icones Plantarum 12: plate 1139 full-page line drawing of Luina hypoleuca
- Tropicos, Luina Benth.
- Flora of North America Vol. 20 Page 627 Luina Bentham, Hooker’s Icon. Pl. 12: 35, plate 1139. 1873.
- The Plant List search for Luina
- Biota of North America Program 2013 county distribution maps
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Media related to Luina at Wikimedia Commons