This collection in the U.S. National Herbarium is the sole basis for positing a New Mexico occurrence for C. texana, as reported in Nesom 1995 with some qualification as to its certainty. [Image below.]
But it would appear that in general Parry's Mexican Boundary Survey collections do not provide reliable locations.
In his treatment of Asclepias in New Mexico, Eugene Jercinovic notes:
Another taxon of question in New Mexico is A. emoryi. No specimens are listed in the New Mexico Biodiversity database or the SEINet database. ... The holotype (as Podostemma emoryi, US) was collected by C.C. Parry during the Mexican Boundary Survey, but the location given; "Rio Grande Valley below Dona Ana" is quite indefinite. In fact, the location shown on the sheet is "Texas or New Mexico." Wooton and Standley in their 1915 Flora of New Mexico state, "It is impossible to tell where the type was collected..."
Again, R. C. Barneby, Pugillus Astragalorum VII: A Revision of the Argophylli (1947), notes for Astragalus amphioxys Gray (p. 438):
Type-Locality.-DoniaAna, New Mexico; collectedby GeorgeThurber.2 ...
2 The Mexican Boundary Survey labels are often inaccurate (cf. Standl.,Cont. U. S. Nat. Herb. 13:146. 1910), and the plant in question may well have been collected in western Texas.
