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CONTRIBUTIONS ‘TOWARD A

FLORA OF NEVADA, NO 6,

ULMACEAE OF NEVADA

by

F, R. FOSBERG

November 1, 1940,

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Issued by

The Division of Plant Miphoration and Introduction, Bureau ox Plant Industry, U.S. Departuentvol Agriculture, Washington, D.C.

Work Projects Administration of Nevac

cay Projects, 0. P,.65-2-04-13, W. P. 658; Ooi Pi 75+ ae OLa21,, We Po. 752.

Collaborator

University of Nevada,

Addvess ail queries concerning this publication to the Division of Plant Expleratvion ang introduction, Bureau of Plant Industry, U.S. Departnent of Agriculture, Washington, D. C.

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Address all ouerics concerning this publication to of Plant Exploration and Introduction, Bureau of Plant Industry, _ U.S. Department of Agriculture, Washington, D. C.

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CONTRIBUTIONS TOWARD A FLORA OF NEVADA. NO 6,

ULMACEAE OF NEVADA

by F, R. FOSBERG

November 1, 1940,

Issued by

The Division of Plant Fxploration and Introduction, Bureau of Plant Industry, U. S. Department of Agriculture, Washington, D. ©.

Work Projects Administration of Nevada, Projects, 0. P, 65-2-O04-13, W. P. 658; O, P, 165=2-04-21, W. P. 752,

Collaborator

University of Nevada,

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the Division

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ULMACEAE OF NEVADA

By Fe Ro Fosberg

Mostly trees, not focwirercuas leaves simple, alternate, usually basally trinervate; stipules present but early caducous$ flowers perfect, polygamous, or monoccious, with single very small calycoid perianth whorl of 4-9 parts, united at base; stamens «6, ercct, non=cxplosives; pistil of a single-celled ovary with one

suspended ovule, and two styles; fruit a samara, nut or drupe.

One genus wild in Novadas

le CELTIS L.

Trees with thin, smooth or very warty barks; leaves noticcably trinerved, entire to serrate, often scabrous, usually oblique at base; flowers monoecious, the staminate in small cymes, the pis-= tillate solitary or in few=flowered fasicles, calyx 5-6 parted, stamens 5-6, stigmas elongate, divergent, fleshy; fruit a drupe with thin flesh, stone prominently reticulate.

One variety of one species found in Nevada.

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1, CELTIC OCCIDENTALIS L. VAR. RETICULATS (Torr.) Sarg. Cat. For.

Tr. Ne Am. 126, 188).

Celtis douglasii Planch. arn. Sei. Nat. III, 10: 2936 188.

Celtis reticulata Torr. Ann. Lyc. N. Y. 2: 2h7. . 182,

Coltis mississippiensis Bose var. reticulata Sarge Ne Ame

Silva 7: 72s 18956

Celtis villosula Rydb. Pl. Rocky Mts. ed. 2, 1116. 1922.

A small scraggly tree, often partiolly leafless; leaves ovate or broadly ovate, oblique at base, often somewhat cor-= date, entire to somewhat serrate, upper surface scabrous, or rarely smooth, veins impressed, lower surface pale or greenish, strongly reticulate veined when fully mature, slightly pubes-= eent, shortly petioleds; fruit solitary, axillary, pedicel variable in length, eas much as scveral times as long as peti-g ole, drupe globose, 6-8 mm, thick.

I am treating this as a variety of the polymorphous eastern C. occidentalis simply because the charactors uscd to separate the various species of this relationship are too in- constant and insignificant to bo regarded as specific. In general, material from the western States has thicker leaves, Moro prominienG veins, ond less serrate margins, and it is on this basis that I separate this variety, The characters con-= cerning the relative lengths of petiole and pedicel are so variable as to have no value. Fruit size and color varies from place to place, but not convincingly. The whole complex

gives the impression of a very heterozygous ond widespread

Ps a BR As toed

population which presents a consequently highly variable set of reactions to the diverse environments to which it is sub= jected over its wide range. A monographic study with careful correlation of morphology with environment might alter this opinion, but would as likely confirm it.

Nevada: Lincoln County.