EcoFlora - Mentzelia

Mentzelia
Family: Loasaceae Teague Embrey	VPAP Gleason & Cronquist Resources JANAS 30(2) PLANTS: Annuals or perennials, ours herbaceous to suffrutescent; hairs often barbed, not stinging. LEAVES: sessile (including those with blades narrowing gradually to the base) or distinctly petiolate; blades linear, lanceolate to elliptic, ovate or oblanceolate; margins dentate to pinnately lobed, sometimes crenate or entire. PLANTS: Annuals or perennials, ours herbaceous to suffrutescent; hairs often barbed, not stinging. INFLORESCENCE: cymose. FLOWERS: subtended by O-several, leaf-like to linear bracts; calyx mostly persistent, the lobes lanceolate to subulate; petals distinct or basally coherent and adherent to filaments, deciduous, white to yellow or orange; stamens 10-ca. 300, shorter than the petals, free or basally coherent, those of outer whorls often with broad filaments and often forming petaloid staminodia; pistil (in ours) 3-carpellate, exceptionally more; stigmas 3 appressed lobes but appearing as 3 grooves, sometimes separating in age. CAPSULES: apically dehiscent by 3 valves. SEEDS: 10-many, rarely fewer, 1-4 mm long, parietal; testa diversely sculptured, smooth, reticulate or striate at low magnification; endosperm present. X = 14. NOTES: At least 100 spp.; New World. (for C. Mentzel). The sections are sufficiently distinctive that several have occasionally been treated as separate genera. Fruit measurements (and the term -body-) refer to the seed-containing portion, exclusive of the calyx lobes when these persist. Specimens that are depauperate or that lack mature fruits and seeds may be impossible to identify. REFERENCES: Christy, Charlotte M. 1998. Loasaceae. J. Ariz. - Nev. Acad. Sci. 30(2): 96. Vascular plants of NE US and adjacent Canada Hypanthium ovoid to cylindric or obconic; sep 5; pet 5-10; stamens 10-200, distinct or connate into fascicles; ovules 2-many on 3 parietal placentas; style 3-lobed; fr a capsule; annual or perennial herbs or shrubs, armed with stiff, barbed hairs, with alternate, serrate to pinnatifid lvs and 1-many often large, white to yellow or orange fls terminating the branches. (Nuttallia) 50, New World. Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp. ©The New York Botanical Garden. All rights reserved. Used by permission.
Species within inventory project: Arizona Flora Mentzelia affinis Map not Available Mentzelia albescens Map not Available Mentzelia albicaulis Map not Available Mentzelia argillicola Map not Available Mentzelia aspera Map not Available Mentzelia asperula Map not Available Mentzelia canyonensis Map not Available Mentzelia collomiae Map not Available Mentzelia cronquistii Map not Available Mentzelia desertorum Map not Available Mentzelia dispersa Map not Available Mentzelia goodrichii Map not Available Mentzelia hualapaiensis Map not Available Mentzelia integra Map not Available Mentzelia involucrata Map not Available Mentzelia isolata Map not Available Mentzelia jonesii Map not Available Mentzelia leucophylla Map not Available Mentzelia lindheimeri Map not Available Mentzelia lindleyi Map not Available Mentzelia longiloba Map not Available Mentzelia memorabilis Map not Available Mentzelia montana Map not Available Mentzelia multiflora Map not Available Mentzelia nitens Map not Available Mentzelia nuda Map not Available Mentzelia obscura Map not Available Mentzelia oligosperma Map not Available Mentzelia oreophila Map not Available Mentzelia polita Map not Available Mentzelia pterosperma Map not Available Mentzelia puberula Map not Available Mentzelia pumila Map not Available Mentzelia rhizomata Map not Available Mentzelia rusbyi Map not Available Mentzelia texana Map not Available Mentzelia tiehmii Map not Available Mentzelia tricuspis Map not Available Mentzelia veatchiana Map not Available