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Fiche no 64938.
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Agave utahensis v. nevadensis Engelmann ex Greenman & Roush 1929

Publication New Agaves from Southwestern United States, Annals of the Missouri Botanical Garden 16(4) : 390 (389-392, pl. 32) (30 décembre 1929).
Type : S.B. & W.F. Parish 41 (ou 414?), USA, Californie, San Bernardino, Désert de Mohave, Ivanpah Mts, Mai 1882, conservé au Missouri Botanical Garden de St Louis (U.S.A.) (MO : holotype) et à l'Académie des Sciences de Californie (U.S.A.) (CAS : isotype).

Synonyme de

Agave utahensis Engelmann 1871

Commentaires

Description originale (Engelmann ex Greenman & Roush 1929) :
"Two specimens of Agave were submitted recently to the Misouri Botanical Garden by Mr. W. I. Beecroft of Escondida, California, for identification. These plants had been collected at an altitude of 4000-5000 ft. in the mountains of southwestern Nevada. They seem to accord with material in the herbarium which Dr. Engelmann had referred doubtfully to Agave utahensis, as a possible variety. A more careful examination shows that they differ from that species, of which the type material is in the Garden Herbarium, in several important details.
In the comprehensive studies of the Agaves of the United States by Miss A. Isabel Mulford under the careful direction of Dr. Wm. Trelease, the material studied by Dr. Engelmann was merged, possibly because of its fragmentary nature, with Agave utahensis. A critical comparison of these fragments and the specimens from southwestern Nevada with the type of A. utahensis shows the following striking differences:
A. utahensis Leaves strongly inrolled in the terminal portion. Terminal spine stoutish, deeply grooved, 2.5 cm. or less long. Perianth-tube very slender, 4-5 mm. long. Perianth-segments 10-12 mm. long.
A. utahensis var. nevadensis Leaves not strongly inrolled in the terminal portion. Terminal spine slender, flat or shallowly grooved on the upper surface, 5 cm. or more long. Perianth-tube stoutish, 1-2 mm. long. Perianth-segments 8-10 mm. long.
These differences warrant the recognition of this plant at least as a distinct variety which is characterized as follows:
Agave utahensis Engelm. in Watson, Bot. King. Exp. 497. 1871.
Var. nevadensis Engelm.(1) in herb. Plate 32.
Stem short, thick, 3-4.5 cm. in diameter; leaves lance-attenuate, 1-2.5 dm. long, 2 cm. or less broad, dilated at base (3-5 cm.), glaucous and minutely scurfy on both surfaces; terminal spine slender, linear-attenuate, grayish, pungent, 3-6 cm. long; marginal prickles 2-4 cm. apart, flattened, grayish white, friable, mostly recurved, surrounded at the base, as in the case of the terminal spine, by a narrow dark brownish area; leaf-margins herbaceous, sinuate, becoming minutely serrulate on the upper portion of the dilated base; flowers about 2.5 cm. long, ovary 10 mm. or less long, perianth-tube stoutish, 1-2 mm. long, perianth-segments 8-10 mm. long.-California: Ivanpah, Mohave Desert, May, 1882, S. B. & W. F. Parish 414 (Mo. Bot. Gard. Herb.), type. Specimens from southwestern Nevada sent recently to the Missouri Botanical Garden by Mr. W. I. Beecroft for identification appear to belong to this variety.
(1) Agave utahensis Engelm. var. nevadensis Engelm. in herb. Perennis; caulibus brevibus, crassibus, 3-4.5 cm. diametro; foliis lanceo-attenuatis, 1-2.5 dm. longis, 2 cm. vel minus latis ad basin (3-5 cm.) dilatatis, utrinque glaucis et minutissime porriginosis; spina terminali tenui, lineari-attenuata, cinerea, 3-6 cm. longa; aculeis complanatis, cinero-albidis, friabilis, plerumque recurvatis, circa basin ferrugineis, 2-4 cm. remotis; marginibus foliorum ad basin dilatatis, integris vel serrulatis; floribus ca. 2.5 cm. longibus; ovario 10 mm. vel minus longo; tubo perianthii 1-2 mm. longo; lobis perianthii 8-10 mm. longis.— California: Ivanpah, Mohave Desert, May, 1882, S. B. & W. F. Parish 414 (Mo. Bot. Gard. Herb.), type.
PLATE 32: Agave utahensis Engelm. var. nevadensis Engelm. in herb. Nevada. From a living plant collected by Mr. G. E. Barrett in southwestern Nevada.

Étymologie

Agave : du grec agavos, noble, illustre, admirable, sans doute en référence à sa belle stature.
utahensis : en référence à l'état d'origine, l'Utah aux U.S.A.
nevadensis : en référence à l'état d'origine, le Nevada aux U.S.A.

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Auteur

philippe (contacter l'auteur ou écrire aux admins de l'encyclopédie)
Fiche créée le 26/09/2013.


Fiches de botanistes :

image disponible Engelmann, George

Fiche du genre :

image disponible Agave (Linné)

Synonymes :

Aucune fiche.

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