9«.. at^miRlBUTIONS IX) WESTERN BOTANY NO. 15 



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NirAL NOTES MADE ON MEXICAN 

 niE MONTHS OH. OCTOBER AND N 



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Ncgales, Arizona-; is on the dramage of the Santa Cruz river, 59 

 miles s<:»uth of TucsoKj 3,800 feet altitude, and over 1,000 feet higher 

 than Tucson, in th'e upper edge of the Tropfcal life zone, screw-bean area. 

 The topography consists of rolling volcanic hiTls^ apparently sand,, seem- 

 ingly stratified. . The ^rubs: are mostly screw-bean (Prosopis pubescens), 

 .some Sambucus glauca^ some Fraxinus (i^stacfaefolia), Baccharis sergili- 

 oidcs, rarely a scrub oak (Q. undtilata?), but 5crew-bean everywhere even 

 on the hills; Some Yucca (like Mohavensis but not that species), but 

 leav .s shorter, Nolina, Daslirion, rarely Opuntia of the occidentalis class. 

 No Cereus, Hills covered with grasses which are mostly Bouteloua curti- 

 prndiila, eriocephalaK an annuaf sp,, hirsuta, Eragrostis, Muhlenbergia 

 tlcbilis, Andropogon scaccharoides, glaucus? Panicum autumnale, P. sco- 

 pariuni ?; Sporobolus nimulosus, cryptandrus. Tragus, Aristida Califomica 

 hut a grsps l-rfeet liigH and very abundant, Heliomeris annua very com- 

 mon. ". A|>lc>pa;ppus gragilis,. . Verbesina encelioides, Ipomoea 3 species, 

 I-agenarla. Acalyph a, Euphorbia, prostrate species, Pectis, 2 sp. Brickellia. 

 . OfctbKer ZS, 1926. On train going south, 4,000 feet altitude. Still 

 jomg up, out. of the mesquit and into the live oaks (shiny black oak). 

 Villanova common. Senecio ' Dougla.sii common. Ambrosia, Aplopappus 



(TM^.Tic ,.^«n,. r-r.^ Heliomeris. Country is a great rolling - prairie 



v.un raiicn oafc ana a little drier thanNogales after we reach the toip 

 and^begm to descend:' Agua Zarca Station, 3,800 feet altitude. Oaks 

 nr ariv gone, mesquit coming in, Xanthium on flats, Heliomeris, Fraxinus 

 I istaciafaha, also Populus Fremonti on flats. A pond of water on the 

 left and ranch. Salix amvgdaloides (group) Grasses the same as before. 

 Sambucus glauca. Cultivated squash, com. Eriogonum annum, Cheno- 

 jxHlmm ambrosiodes. Smooth outlines of hills show they have long been 

 grassed- over. Baccharis .sergiloides. Walnuts (Calif.). Now come to a 

 jtream flowing soutfi. " Chilopsis, Acacfas, Beorchaavia. brush .houses. 

 bpirog}Ta, Dalea mollis ? Setaria glauca. Celtis occidentalis, Vitis Ariz., 

 .\mbrosia very common. 3:300 feet altitude. Oaks now gone, mesquit 

 .verywhere^ Cult, potatoes and com. Crotalaria. Cibuta Sta. Big, black 

 wujows (S. amyg. ?). Amarantus fimbriatus, Celtis, Helianthus annuu.«» 

 riatanu^, screw-bean, hig Celtis occidental, 40-50 feet high. Pluchea 

 llfhnr' ^'^""/^S .^^'^s again. 3,100 feet altitude passed through canon 

 mth quartzue looking eniptives. Thurberia, Baccharis viminea. Station. 

 did not get the name. Dense brush, peach trees, Vitis, Walnuts, Celtis, 



ttre^!^ n T' 'ur^'\ perennis, sunflowers 10 feet high. Quite » 

 aS. r "^^^"^"5^ nzt^nvs, Fouquiera on the hini 2,900 feet 

 le ffa; O^^Tn?- "^'5- f ''''"' CyH^dropuntia prolifera group, also spine- 

 tZ (L?!^ , and large, not cultivated. Cumeral station. Umbrella 



Srii S^Th-^^ ^"^^VnT' «"^^^"^'*' ™"^^ Fouquiera splendens, Bac- 



tZl ^^ ff~ ""J'^'r H^li°»«^rfs, Rhamnus-like shmb, Ambrosia 

 tnfida or scanetRiro tfiat f '" 



