TORCH
The Texas Oklahoma Regional Consortium of Herbaria
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Mentzelia
Family: Loasaceae
Mentzelia image
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  • Gleason & Cronquist
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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: TORCH Species Lists
Mentzelia albescens
Image of Mentzelia albescens
Mentzelia albicaulis
Image of Mentzelia albicaulis
Mentzelia asperula
Image of Mentzelia asperula
Mentzelia decapetala
Image of Mentzelia decapetala
Mentzelia humilis
Image of Mentzelia humilis
Mentzelia incisa
Image of Mentzelia incisa
Mentzelia lindheimeri
Image of Mentzelia lindheimeri
Mentzelia mexicana
Image of Mentzelia mexicana
Mentzelia montana
Image of Mentzelia montana
Mentzelia multiflora
Image of Mentzelia multiflora
Mentzelia nuda
Image of Mentzelia nuda
Mentzelia oligosperma
Image of Mentzelia oligosperma
Mentzelia pachyrhiza
Image of Mentzelia pachyrhiza
Mentzelia reverchonii
Image of Mentzelia reverchonii
Mentzelia saxicola
Image of Mentzelia saxicola
Mentzelia strictissima
Image of Mentzelia strictissima
Mentzelia texana
Image of Mentzelia texana
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