240 standley: floras of new Mexico and Argentina 



Cressa australis petiolata Meissn. 

 Gilia valdiviensis Griseb. 

 Lappula redowskii (Lehm.) 



Greene 10 

 Phyla nodiflora (Michx.) Greene 11 

 Verbena gracilescens Cham. & 



Schlecht. 

 Lycium floribundum Dunal 

 Lycium pubescens Miers 

 Lycium wilkesii Ball 

 Nicotiana monticola Dunal 

 Plantago patagonica Jacq. 

 Plantago rocae Lorentz 

 Ambrosia tenuifolia Spreng. 

 Aster squamatus (Spreng.) Hieron. 

 Baccharis juncea Desf . 

 Baccharis salicifolia Pers. 

 Flaveria bidentis (L.) Kuntze 

 Gaillardia megapotamica scabio- 



soides Baker 

 Gnaphalium cheiranthifolium 



Lam. 12 

 Solidago microglossa DC. 



Tessaria absinthioides DC. 

 Thelesperma scabiosoides Less. 



Cressa truxillensis H. B. K. 

 Gilia inconspicua (Smith) Dough* 

 Lappula occidentalis (S. Wats.) 



Greene 

 Phyla incisa Small 

 Verbena neomezicana (Gray) Small 



Lycium parvifiorum Gray 



Lycium torreyi Gray 

 Nicotiana trigonophylla Dunal 

 Plantago purshii Roem. & Schult. 

 Plantago major L. 

 Ambrosia artemisiaefolia L. 

 Aster exilis Ell. 

 Baccharis wrightii Gray 

 Baccharis glutinosa Pers. 

 Flaveria campestris Johnston 

 Gaillardia pinnatifida Torr. 



Gnaphalium chilense Spreng. 



Solidago arizonica (Gray) Woot. 



& Standi. 

 Tessaria borealis Torr. & Gray 

 Thelesperma gracile (Torr.) Gray 



In some of the cases cited the resemblance is very striking, for 

 example, in the instance of Ephedra, Atriplex, Draba, Lupinus, 

 Vicia, Sida, Nuttallia, Androsace, Solidago, and Thelesperma. 

 The two Sidas belong to a small group which, in the United States, 

 is chiefly southwestern. Other instances of representatives of 

 genera or groups of species which with us are typical of the arid 

 southwest, are found in species of Ephedra, Hoffmanseggia, 

 Strombocarpa, Covillea, Condalia, Sphaeralcea, Menodora, Cressa, 

 Gilia, Lycium, Baccharis, Flaveria, Tessaria, and Thelesperma. 

 It is interesting to note that in Argentina the cresote bush, 

 Covillea, is represented by three species, while in the southwest 



10 The determination of this species is doubtfully correct. At any rate, the 

 plant is very close to L. occidentalis. 



11 The plant so determined may not really be P. nodiflora, but it is very like 

 P. incisa. 



12 The specimens so determined are different from the plant of western South 

 America found in herbaria under this name. 



