|
(Last Modified On 6/14/2013)
|
|
|
|
(Last Modified On 6/14/2013)
|
|
Genus
|
Unxia L. f.
|
|
PlaceOfPublication
|
Suppl. P1. 56. 1781.
|
|
Note
|
TYPE: U. camphorata L. f.
|
|
Description
|
Annual herbs to suffruticose perennials, 12-50 cm tall; stems terete, dichot- omously branched. Leaves narrowly ovate to lanceolate, 2-10 cm long, 0.4-2.7 cm wide, acute; sessile to shortly petiolate. Inflorescence of one to several heads; sessile or peduncles 1-5(-10) mm long. Heads radiate; involucres multiseriate, the bracts free, the outermost bracts 2, ovate, acute-acuminate, opaque, the inner bracts 5-8, membranaceous, the margin scarious, obtuse-acute; receptacle convex, paleaceous; paleas lanceolate, scarious, acuminate; ray florets with ligules yellow, narrowly oblong, apically rounded, flared at base into an annular disc, the style branches filiform, flattened, obtuse; disc florets with corollas yellow-orange, regular, 5-lobed, the lobes narrowly acute, the throat narrowly funnelform, the anthers exserted from corolla ca. '/2 of length, the style linear-capillaceous, undivided, the ovary sterile, pappus absent. Achenes ovoid, laterally compressed, narrowly keeled on adaxial and abaxial sides, notched at the point of attachment; pappus absent. Chromosome number n = 16.
|
|
Habit
|
herbs
|
|
Distribution
|
This is a genus of 2 species in northern South America reaching into Panama.
|
|
Note
|
Unxia was regarded for over 100 years as belonging in Melampodium, but recent studies (Stuessy, 1969) have reestablished the genus as a close relative of Polymnia.
|
|
Reference
|
Stuessy, T. F. 1969. Re-establishment of the genus Unxia (Compositae- Heliantheae). Brittonia 21: 314-321.
|
|
Tag
|
|
|
|
Project Name
|
|
Tag
|
|
|
|