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We are pleased to be able to present
APPENDIX
B POTENTIAL SPECIES OF
THE DEAD HORSE MOUNTAINS
These are species that
have been collected close to the study area and/or species whose known
distributions make their occurrence within the study area likely, or unvouchered
species listed on previous surveys.
Unless otherwise noted, all distribution information is based on Turner
et al. (2003) and/or collection information from the University of Texas at
Austin herbarium's online database (TEX 2003). If a taxon was listed without a voucher collection in either
of the two previous area surveys (Wells 1965, Amos and Giles 1992), it is noted
as such. AGAVACEAE Dasylirion heteracanthium I. Johnst. Listed
by Amos and Giles (1992), citing a specimen at BIBE, however no specimen was
found. During the SRSC search, a
specimen collected in Brushy Canyon and originally identified as D.
heteracanthium was discovered (AMP & SAP 5127).
Despite having few, if any, retrorse marginal teeth, the current
annotation places it with D. leiophyllum. This species is reported
to occur in south Brewster and Presidio counties (Powell 1998) but no
localities or specimens are cited. AMARANTHACEAE Amaranthus
retroflexus L. Listed by Amos and Giles (1992); known locally from the
Chisos and Glass Mountains. ASTERACEAE Cirsium
undulatum (Nutt.) Spreng. Listed by Wells (1965); known locally from
several areas in Brewster County. Erigeron
flagellaris A. Gray. Listed by Amos and Giles (1992); known locally
from the Chisos Mountains and southern Pecos County. Heterotheca
sp. Listed by Amos and Giles
(1992); two species occur in the region: Heterotheca fulcrata and Heterotheca subaxillaris. Machaeranthera
blephariphylla (A. Gray) Shinners. Listed by Amos and Giles (1992); north
Brewster County and westward distribution. Ratibida
columnifera (Nutt.) Wooton & Standl. Listed by Amos and Giles (1992); common
throughout the state. Simsia calva (A. Gray & Engelm.) A. Gray. Listed by Amos and Giles (1992); well-represented
regionally. Tetragonotheca sp.
Listed by Amos and Giles (1992); Tetragonotheca texana is the only species with a feasible distribution in Turner
et al (2003). BORAGINACEAE Heliotropium
molle (Torr.) I.M. Johnst. Possible; collected by NPS staff at Dog
Flats; many other collections are known to the north. BRASSICACEAE Synthlipsis greggii
A. Gray. Known from Dog Flats and
to the east in BGWMA. CACTACEAE Echinocereus x roetteri (Engelm.) Engelm. ex Rümpler var. neomexicanus (J.M. Coult.) A.D. Zimmerman. Expected according to Powell and Weedin
(2004). Echinocereus
viridiflorus Engelm. var. russanthus (Weniger) A.D. Zimmerman. Expected according to Powell and Weedin (2004). This name is also the best approximated
synonym of the taxon Echinocereus chloranthus listed by Amos and Giles (1992) and collected at the
McKinney Spring ranch house and northward on the Old Ore Road. Epithelantha
bokei L.D. Benson. Possible; occurs just outside of the
study area near the Rio Grande. Lophophora
williamsii (Lem. ex Salm-Dyck) J.M. Coult. Possible; the study area contains the
appropriate habitat. Opuntia
azurea Rose var. parva A.M. Powell & J.F. Weedin. Expected according to Powell and Weedin
(2004). Opuntia
imbricata (Haw.) DC. Expected according to Powell and Weedin
(2004). Opuntia
phaeacantha Engelm. Listed by Amos and Giles (1992). This species has a more northerly
distribution in the Trans-Pecos, but the similar Opuntia camanchica is one of the most common species in the Trans-Pecos
and is expected throughout the study area (Powell and Weedin 2004). Opuntia
strigil Engelm. var. strigil.
Listed by Amos and Giles (1992); occurs just outside of Brewster County
to the east. FABACEAE Desmanthus
glandulosus (B.L. Turner) Luckow. Expected; has been collected elsewhere
in BBNP, is not an especially restricted species, and is well-represented
regionally. HYDROPHYLLACEAE Nama
torynophyllum Greenm. Several collections have been made near
Hot Springs, and in Dog Flats. LAMIACEAE Scutellaria
drummondii Benth. Listed by Amos and Giles (1992); of several varieties, var. edwardsiana occurs to the north of the study area. LILIACEAE Allium
drummondii Regel. Collected from several locations in BGWMA and west of
Stillwell Crossing. Allium
perdulce S.V. Fraser var. sperryi Ownbey.
Known from Dog Flat. LOGANIACEAE Emorya
suaveolens Torr. Possible; the only Texas locality is on Maravillas Creek in
BGWMA, just east of the study area. PAPAVERACEAE Argemone
squarrosa Greene subsp. glabrata G.B. Ownbey. Listed by Amos and Giles (1992); known from northern Brewster
County. POACEAE Scleropogon
brevifolius Phil. Listed by Wells (1965). Turner et al. (2003) records this
species in the study area but no specimens were discovered. Voucher collection localities near the
study area include Dog Flats and the Chisos Mountains, in addition to many
areas near Alpine and Marathon (TEX 2003). POLEMONIACEAE Gilia
rigidula Benth. var. rigidula. Expected according to Turner et al. (2003). POLYGALACEAE Polygala
maravillasensis Correll. Collected in Black Gap along the river
and in the lower canyons of the Rio Grande. PTERIDACEAE Notholaena
aliena Maxon. Possible according to Yarborough and Powell (2002). Locally known from BGWMA and the Chisos
Mountains. Notholaena
copelandii C.C. Hall. Possible according to Turner et al.
(2003) and Yarborough and Powell (2002). RUBIACEAE Hedyotis
angulata Fosberg. Occurs sporadically in the Trans-Pecos, mostly to the
east. One collection was made just
east of the DH in BGWMA SALICACEAE Populus
angustifolia E. James. Reported to occur in the RGV area
(Powell 1988) and expected according to Turner et al. 2003. SOLANACEAE Chamaesaracha
coronopus (Dunal) A. Gray. Listed by Amos and Giles (1992); regionally
common. VERBENACEAE Glandularia racemosa
(Eggert) Umber. Known from Dog Flats.
by Joselyn Fenstermachter 2007
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