A new Agave from Oaxaca, Mexico

Abstract

Planta acaulis monocarpica; foliis 25-30 rosulatis ovato-lanecolatis carnosocoriaceis pcrsistenter glaueis, crassis 35-50 cm longis, 15-25 cm latis, spina terminali aculeato-pungenti 1-3 cm longa; spinis marginalibus iuaequalibus, 1-2-cuspidatis, obil~sis, brunneis, 1-~ mm longis, 2-9 mm latis; scapo inflorescentia incluaa 2-4 m alto, graeili; bracteolis scariosis, subulato-lanceolatis, 1-2 cm longis; peduneulis 1-2-furcatis, 8-25 mm longis; ovario cylindrico viridi, 15 mm longo apice constricto; tubo nullo; segmentis aequalibus, 17-18 mm longis exterioribus 5 mm latis, interioribus 4 mm latis, pallidi-luteis, adscendentibus; filamentis 30-35 mm longis ad basin segmentorum insertis; antheris luteis 13 mm longis. Acaulescent, mostly single, few-leaved, light gray or white-glaucous; open rosettes with ca. 30 leaves at matur i ty ; leaves ovate to ovate-lanceolate, shortacuminate, openly ascending, nearly plane above but briefly and narrowly channeled apieally, the margins variously serrate with flattened, blunt, 1to 2euspidate, dark brown, fin~ or coarse teeth; epidermis finely and densely papillate; spine acicular, dark brown, rounded above and below, not decurrent or decurrent for about its own length in a corneous margin; inflorescence spicate, the stalk flowering from near the base, erect ; upper Lraets and bracteoles similar, 1-2 cm long, 3 mm wide at the deltoid base, scarious, recurred, long attenuate, with a dark midvein; flowers inconspicuous, 3'3-35 mm long (from base of ovary to apex of tepals) at anthesis; tepals pale yellow or yellowish white, elliptic, openly ascending, straight; anthers yellow, excentrically attached, versati le; capsules (immature) 22-24 mm long, oblong, thin-walled.-Type, in U.S. National Herbar ium (US), Getttry 16~36, 25-27 km NW of Tehuantepec, Oaxaca, Mexico, 22 Mar 1957, on Guiengola limestone at ]25 m altitude. From the same locality, Gentry 12241, 30 Sep ]952, leaves and young plants only. Agave guiengoZa is a str ikingly ornamental species, distinct because of its broad, thick, white glaucous leaves serrated by numerous broad, low, blunt, darkcolored teeth. The light shade in which some individuals grow suggests that it will tolerate some shade without the etiolation that deforms other Agave leaves in similar situations. The vir tua]ly tubeless flower with its consequently distinct tepals, and the insertion of the filaments at the base of the tepals, show a close relation to Agave bracteosa S. Wats. and A. elle~tectiana Jaeobi in the section Anoplt~ga~,e Berger (subgenus Littaea) (Berger, Alwin. Die A~'aven. pp. 121-127. Jena, 1915). Its broad, white, ovate leaves with their conspicuous coarse teeth, and its monoearpie rather than polycarpic habit, set off Agave guie~gola distinctly from either of the species mentioned. The population observed at the type locality showed individuals varying in the form and size of both leaves and teeth. On one variant the lower two-thirds of the leaf margins were with(rot teeth. Altogether, however, the plants appeared to constitute a well lutegrated species, indicating normal sexual reproduction via seed dissemi-

DOI: 10.2307/2805209

1 Figure or Table

Cite this paper

@article{Gentry2008ANA, title={A new Agave from Oaxaca, Mexico}, author={Howard Scott Gentry}, journal={Brittonia}, year={2008}, volume={12}, pages={98-100} }