A new combination and a new variety in Artemisia tridentata (original) (raw)
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Xeric Big Sagebrush, a New Subspecies in the Artemisia tridentata Complex
Journal of Range Management, 1991
In I970 a xeric form of mountain big sagebrush (A&m& tridcntata ssp. wmeyunu (Rydb.) Beetle) was reported in west central Idaho. Observations of morphology, habitat, and ecology, and analyses of foliage chemical components, clearly indicate these plants represent a new subspecies (xericensk) in the big sagebrush complex. It grows at lower elevations, 762-1,524 m (2,500-5,000 ft) and drier environments, 305-560 mm (12-22 in) precipitation, than most mountain big sagebrush, and is found on basaltic foothill soils often in association with bluebunch wheatgrass (Agropyron spicatum (Pursh) Scribn. & Smith). In addition to soil type, the radiate growth form and a more branched paniculate inflorescence are 2 morphological characteristics useful in separating ssp. xeri-cc&s from ssp. vuseyunu. It contains higher concentrations of crude protein (10.4%), phosphorus (0.3%), and total volatiles, and lower concentrations of tannins and total phenols than mountain big sagebrush. Distinct cbromatograms were obtained for both subspecies when extracts were analyzed by gas and high performance liquid chromatography. Leaf morphology and fluorescence of leaf water extracts are useful characters for separating ssp. xericend from ssp. tri&~&&. The chemical data, in combination with morphology and ecology, suggest this new subspecies was initially derived by hybridization of ssp. tridcntoto and ssp. vaseyana.
Phytoneuron, 2017
Corrections and additions are provided for the existing typifications of plant names in Artemisia subg. Tridentatae. In particular, second-step lectotypifications are proposed for the names Artemisia trifida Nutt., nom. illeg. (A. tripartita Rydb., the currently accepted replacement name), A. fischeriana Besser (= A. californica Lessing, the currently accepted name), and A. pedatifida Nutt. For several nomenclatural types of names listed in earlier publications as "holotypes," the type designations are corrected to lectotypes (Art. 9.9. of ICN). Newly discovered authentic specimens (mostly isolectotypes) of several names in the group are listed and discussed, mainly based on specimens deposited in the Besser and Turczaninov memorial herbaria at the National Herbarium of Ukraine (KW). The Turczaninov herbarium is particularly rich in Nuttall's specimens, which are often better represented and better preserved than corresponding specimens available from BM, GH, K, PH, and some other major herbaria. Artemisia L. subg. Tridentatae (Rydb.) McArthur (Asteraceae), containing sagebrush species, is a morphologically, geographically and phylogenetically well outlined group restricted exclusively (or mainly?) to North America, which was recently treated taxonomically by Shultz (2006b, 2009). Recent molecular phylogenetic studies confirmed a rather isolated position of the group within the genus (
Lahontan sagebrush ( Artemisia arbuscula ssp. longicaulis ): a new taxon
The Great Basin naturalist, 1995
A new subspecies of Artemisia arbuscula is described, A arhuscula ssp. longicaulis Winward & McArthur, ssp. nov. This taxon is a landscape dominant in portions of northwestern Nevada and adjacent California and Oregon at elevations from 1050 to 2000 m on shallow or argillic (clayey) soils. It differs from A arbuscula ssp. arhuscula in its long floral stalks and large leaves. Morphological, chemical, ecological, and cytological data suggest that it is of hybrid origin. It is hexaploid (6x). We hypothesize that 2x A. arhuscula ssp. arbuscula and 4x A tridentata ssp. wyomingensis are its parents.
Environmental and vegetation relationships of the Artemisia tridentata spp. wyomingensis alliance
The Artemisia tridentata spp. wyomingensis (Beetle & A. Young) S.L. Welsh alliance is the most extensive of the big sagebrush complex in the Intermountain West and is characterized by a wide range of environments and vegetation heterogeneity. The purpose of this study was to identify environmental factors driving variation in plant species composition and determine the potential for using environmental factors to explain vegetation characteristics of the A. tridentata spp. wyomingensis alliance. Seventeen environmental factors and seven vegetation response variables were measured on 107 relatively undisturbed, late seral A. tridentata spp. wyomingensis sites across southeastern Oregon and northern Nevada. Non-metric multidimensional scaling (NMS) was used to identify environmental factors correlated with plant species composition as indexed by canopy cover. Stepwise multiple linear regressions were used to develop models correlating plant cover and structural characteristics with environmental factors. Vegetation composition variation appears to be driven by soil characteristics. Canopy cover of perennial grasses and forbs was moderately correlated with direct incident radiation and soil characteristics, particularly soil texture in the upper 15 cm of the profile. Total herbaceous cover variation was better explained by environmental factors (soil water-holding capacity, incident radiation, depth to Bt horizon, and percent sand in the upper 15 cm of the soil profile) (Po0.0001, R 2 ¼ 0.52) than any other vegetation characteristic. Vegetation structural characteristics (e.g. sagebrush height, canopy volume and canopy cover, density, and plant visual obstruction) exhibited weak or no relationships with measured environmental variables. Limited correlation among environmental factors and some vegetation characteristics was likely due to the large ecological amplitudes and ecotypic variations expressed by many of the plant species in ARTICLE IN PRESS www.elsevier.com/locate/jaridenv 0140-1963/$ -see front matter Published by Elsevier Ltd. (K.W. Davies).
Vascular plant types in the Arizona State University Herbarium
Sida, Contrib. Bot, 2001
funded in 1896 by FredricK M.Indi. the vascular plant herbarium at Arizona State University (ASU) icts as a repository for plant particularly From ihe desert outh . t and Mexico. It now contains )ver 230,000 specimens, ol which 7 3a haw been designated .is types nuluding paratypes. Here we yp( lectotyp vntyp. nd neoi pe md their dupln t R, ion IKthi majorit of t In | i nensare from the United n I t ind Mexieot 1 0 vhilel3irom ourh America and from t he alclWoild Taxonomii dl\ ilk in i|nnr unp pe< nm n hi. Ion IOIIH Vuiu ., ,X'iolt-11 Y>l\gonaccat (=i0) ( a, r i i a i A ) < i ophul u a, • ai t ' ilahu, loMh, v • , u n \ \ < imi \cant haceae 11 Oj. Historical I \ prominent are 00 isoiype spec i mens collected by (AG. Pringle.a promi lent early plant col lei toi in \le\ii o I rom IKPOto 1°0'S Miiinenuh \ p. mile tmns were also made by tines R Revi il No, I 11 Holmgren Howard .. Gentry and (.corg, b. Ilmton For, i h I.a ionvm t\ pa em demographic unit), and date of collection.
Aquilegia, Vol. 12 No. 4, July-August 1988: Newsletter of the Colorado Native Plant Society
1988
The Colorado Native Plant Society Newsletter will be published on a bimonthly basis. The contents will consist primarily of a calendar of events, notes of interest, editorials, listings of new members and conservation news. Until there is a Society journal, the Newsletter will include short articles also. The deadline for the Newsletter is one month prior to its release.https://epublications.regis.edu/aquilegia/1041/thumbnail.jp