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• W2259672098 abstract "The Hawaiian Islands contain two species of Uncinia (Cyperaceae): Uncinia uncinata, with glabrous utricles, occurs at high elevations in Hawai'i , Maui, Moloka'i, and Kaua'i , and is the most common species in New Zealand; U. brevicaulis, with hirsute -strigose utricles , is rare and previously unreported from Hawai 'i. It otherwise occurs in the Juan Fernandez, Fa lkland, and Tristan da Cunha islands, western Chile, and Argentina. Uncinia uncina ta var. ulig inosa is not recogni zed as significantly distinct. The Hawaiian species are not considered taxonomically distinct from plants in their respective home areas. The occurrence of both species in the Hawaiian Islands is con sidered the product of separat e long-distance dispersal events involving bird s. THE GENUS Uncinia (Cyperaceae) contains 4050 species and occurs primarily in the southern hemisphere (except Africa) from New Guinea to New Zealand (32 species), and in South America from Argentina and Ecuador north into Mexico. The genus is similar to Carex , differing in its prolonged rach illa, which terminates in a distinct uncinate hook. The rachilla, representing the central axis of the lateral, one-fruited spikelet, aid s in dispersal of the fruit (a nutlet) contained within a saclike utricle, and this is subtended by a bractlike, deciduous or persistent glume (Figure I). 1 Manuscrip t accepted October 1986. 2 Califo rnia Sta te University, Dep artment of Biology, Los Angeles, California 90032. 3 u.s. Fish and Wildlife Service, Environmental Services, Pacific Island s Office, P.O. Box 50167. Honolulu, Hawaii 96850. As in Carex , the flowers are monoecious, borne in slender spikes with pistillate flowers below staminate flowers. The genus was last monographed by Kiik enthal (1909); New Zealand species have been treated by Hamlin (1959) and Edgar (1970). RESULTSAND DISCUSSION Two species occur in the Hawaiian Islands. Uncinia uncinata occurs in upper mesic to wet forests on Hawai'i , Maui, Moloka'i and Kaua'i, and is one of the most common species in New Zealand, being known from North, South, Stewart, and Chatham islands. The second, pre viously unreported species, U. brevicaulis, is known from a few populations at high elevations on east Maui, and also FIGURE I. Uncinia uncinata and U. brevicaulis. A-F, U. uncinata: A, habit showing inflorescence subtended by elongated basal bracts-glumes, note inset showing distinctive corne ous leaf-margin structure on lower right; B, ligule structure, side and adaxial view; C, inflorescence showing two pistillate florets with sub tendin g glumes, styles, and distincti ve uncinate rachillas; glumes are deciduous, leaving distinct Vor U-shaped scar along rach is as seen at base; D, pistillat e floret showing narrowly lanceoloid, glabro us, beaked utricle, styles, and uncinate rachilla; E, stamen, note narrow filament; F, nutlet showing cylindrical termina l rostellum. All from Henrickson 4084. G-L, U. brevicaulis: G, habi t, note differences in leaf margin structure on lower left as compare d to part A ; this inflorescence had no elongate d basal bracts-glumes; H, ligule, adax ial view, note minute marginal hairs; I , inflorescence showing two pistillate florets with subtending, broade r, persistent glumes, styles, and uncinate rachillas; note minutely ciliat e margins on glumes; J, pistillate floret showing more elliptical utricles with broader, hispid-strigose beaks, styles, and uncinate rachilla; K, stamen, note bro ad filament ; L, nutlet showing conical rostellum. All from Henrickson & Vog13894. Magnificat ions as indica ted; scale shown in part C holds for parts BE, scale in par t 1 holds for parts H K. Delineation by Bobbi" @default.
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• W2259672098 date "1988-01-01" @default.
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• W2259672098 title "Uncinia Pers. (Cyperaceae) in the Hawaiian Islands" @default.
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