24 



are frequently protected by hard or spiny envelopes. In certain cases, especially among 

 cactuses, proliferous shoots, easily detached ;ind quickly rooting, serve the purpose of 

 seeds in providing for the continuance and distribution of species ; and in such instances 

 the very remarkable and significant fact nuiy be noted, that the fruits generally prove 

 abortive, or even revert to the condition of i)roliferous shoots. 



In the accompanying list a great disproportion in the representation of different 

 natural orders and of particular geuera is very plainly exhibited, and tliere is complete 

 absence of some orders and genera usually represented in northern temperate climates. 



The list contains 188 species. Dicotyledons are represented by 169 species, included 

 in 48 natural orders and 144 genera; and monocotyledons include 19 species, comprised 

 in 4 natural orders and 10 geuera. The natural order CompoHiim possesses the largest 

 number of species, viz: 44, or nearly one-fourth of the whole phauerogauic flora. 

 Leguminoste (which includes most of the dwarf trees and larger shrubs) comes next in 

 point of luimber, with 25 species. Other prevalent natural orders are variously repre- 

 sented. Of the lower orders (which are not included in the following list) lichens only 

 are fairly represented. 



Myosurus niiiiimns, L. 

 Berbeiis tiifuliata. Morkand. 

 ArgeuiDiii' mexicana, L. 

 EschsLholtzia Doiifflasii, Hoolc. 

 Coiydalis aurea, Willd. 

 Sisyiiiliiiniii canesceus, JVidt. 

 V^esicaria FeiuUei'i, Cray. 

 V. ar^fyrea, Gray. 

 Dithyrea californica, Har. 

 Lepidinm flavuni. Gray. 

 L. \Vri<;litii, Gray. 

 L. alys.soides, Graii. 

 Cleoniella auarustifolia, Torr. 

 C. longipes, Torr. 

 Clpome, Sonoric, Gray. 

 Polanisia iniinlanduldsa. W. 

 Sesuvuirn Portnlacastrnni, L. 

 Lowisia rediviva, Furcli. 

 L. Bracliycarpa. Enyel. 

 F()iiiini<!ia spleiidens, Eng. 

 Malvastruiu exile, Gray. ' 

 iM. coccineiim, Gmy. 

 il. ilonroauum, Gray. 

 HibiHcus dcmidatiis. Bth. 

 LaiToa mexicana, MorU. 

 Kallstioeiiiia maxima, To/T-ei Gray 

 K. •iiaudiOora, T. et G. 

 Cevallia .siunata, La/i. 

 Petalonyx Thurbeiij G. 

 Mentzelia albieanlis, I>'^L 

 M. Miillitloia, Nutt. 

 Eiiciiide lobata, Gray. 

 Cuc.iirbita dijiitata. Gray. 

 Ai)odaiitb;ia mididata, Gray. 

 Alaiiiillinia idiillospeima, Engcl. 

 il. Grabaiui, Enr/H. 

 Echinocactus Wislizeni, Enjel. 

 E. liovazouthaloiiius, Engel. 

 Cereus dasyacanthus, Eivj. 

 C. Slraniiiieus, Enyel. 

 C. Eii;;chuain)i. Parry. 

 C. Gigaiiteus, Engel. 

 Opnntia basilari.s! Engel. 

 O. Eraoryi, Engel. 

 O. Whipplei, Engel. 

 O. arborescou.s, Engel. 

 (). Parryi, Engel. 

 <.). tft.ssellata, Engel. 

 (). ArbiiRcula. Engel. 

 O. Bijielovii, Engel. 

 O. Uavi.sii, Engel. 

 Pcctis tilipes. llarv. et O. 

 P. Idiigipe.'!, Gray. 

 P. iniberbis, Gray. 

 P. pappo.sa, Harvey et G. 

 Caiphcphoru.s .jiuicens Jltli. 

 >tama Jamaicoiisis, E. 

 Phacelia micrantha, Torr. 

 Gilia aurea, Nutt. 

 Navairetia Sc-hottii, Torr. 

 Ipomnea leptopbyUa, Turr. 

 Evolvuliis argi^nteii.s, I'uli. 

 Nicotiana quadrivalviH, Piirgh. 

 Physaii.f cardiophylla, T. et G. 

 Lyciiiiu pallidum, Miem. 

 Amsonia toiuentosa, T. 

 Asclepias subulata, Dne. 



Thaniiio.sma moiitannm, Torr. 

 lihiis microphylla, Engel. 

 Glossopetaluu .spinesceu.s, Gray. 

 Kliaiiiiias croceus, Xutt. 

 Ceaiiotbiis Pendleri. Gr. 

 Zizypbus Parryi, Torr. 

 Coudalia spatliulata, Gr. 

 ]vricrothaiiiuiiH ericoides, Gray. 

 Kaiwiii.skia Humboldtiaua, Zucc. 

 Aduljdiia infesta, Meinn. 

 Jaiin.sia fiiacili.s. Gray. 

 llitlacaiUlia Ei.ioryi, Gr. 

 Canotiaholacantha, Torr. et Gray. 

 PDlygala scoparia, H. U. K. 

 P. LiudheiTiieri, Gray. 

 V. Pnberula, Gray. 

 P. Xantii, Gray. 

 Krauieria i)arvitolia, Hth. 

 K. canesceus, Gray. 

 Ualea spinosa, Gray. 

 U. Emoi-yi, Gray. 

 D. Fremoutii, T. et G. 

 I). Scliottii, Gray. 



D. divaiicata, lienth. 

 Dalea .scoparia. Gray. 

 U. lanata, Spreng. 

 Petalostemou exile, <f. 

 ^Ia(!b*i-autbera tanacetilblia, 



Xeea. 

 Eieiniastrum buUoides, Gray. 

 Apliauostephiis ramosissimns, 



DC. 

 Gymnosperma corymbo.sa, DG. 

 Gutieirezia Eutbamiie. T.et G. 

 Liijosyiis ;;raveoleus, Torr. et G. 

 Aplopappus spiriulosus, DO. 

 Perityle mida, Torr. 

 P. Enior,\ i, Torr. et G. 

 Bacebaris Eiiioryi, Torr. et G. 

 B. .serj.'iloid.s, T. et G. 

 Mclampodiuin ciuereum, DO. 

 Dicoria cauescens, T. et G. 

 Fraiiseria dmno.sa, Gray. 

 I"\ deltoidca, Torr. 

 Floui'cnsia cernua, DC. 

 Encelia conspersu, Bth. 



E. nivea, lientli. 

 Sim.sia caiiescen.s. Gray. 

 S. rrutescj-us. Gray. 

 Hymeiiatbcriiiii acernsinii. Gray. 

 H. pentaebictuni, DC. 

 iS'icolletia Edwardhii, Gr. 

 Poropbylluiii seoparium, Gray. 

 Palatbxia linearis. iMg. 



Babia rubella. Gray. 

 B. biteriiata, Gray. 

 Vj. coidatuni, Toi-r. 

 E. Abertiaunm, Torr. 

 Cborizaiitlie brcvicornu, Torr. 

 Acantbogoiium rigiduui. Torr. 

 Centrfistefjia Tliurberi, G. 

 Aobyronycbia Cooperi. G. 

 Acaiitbocbiton Wriglitii, Torr. 

 Sarratia Bfrlaiidieri. Moq. 

 Giiilb^mina deii.sa, Moq. 

 Alternantbera lauuginosa, Torr. 

 Obioiie canesceus, Moq. 



A. Xuttallianus, Gray. 

 A. Fremoutii, T.et G. 

 Lupiuu.s pusillu.s, Pursh. 

 Sopbora seiieea, Xutt 

 Hoffinausesgia micropbylla, Torr. 

 H. drepanooarpa. Gray. 

 Cereidiuui lioridum, lith. 

 Cas-sia baubiuioide.s, G. 

 C. Pumilio, (rray. 

 Parkiusouia micropbylla, Torr. 

 Altjarobia iilandubisa, Torr. et 6. 

 Mimosa Lindbriiiicri, G. 

 Acacia (irci-iiii, Clray. 

 A. coiistricta. Ilenfli. 



A. ScJiottii, Torr. 

 Pruuus miuutitiora, E)ig. 

 CBrcocar])us parvil'olius, Nutt. 

 Gowania mexicana, Don. 

 Fallu;;ia jiaiadoxa, Torr. 

 Pursliia trideiitata, DG. 

 Oiuotbira albi(;aulis Nutt. 

 (E. cbamaMicrioides, G. 



(K. clavajformis, Torr. 

 (E. cardiopliylla, Torr. 

 (E. brevipes, 'I'orr. 

 CE. dentata, Cav. 

 Buriidia lauosa. Gray. 

 Tricboptiliuiu incisuui, G. 

 Baili'va jiauciradiata, G. 



B. pb'-niradiata, JI. et G. 

 Arteniisia tiidcntata, Psh. 

 A. tilifoli.T, Torr. 

 Psatliyrotes annua, Gray. 

 P. Mcajios.'i, Gray. 

 Seuccio longilobus, Ilth. 

 Rafinesquia nco-niexicana, G^ray. 

 Lyjioilcsniia.jiiucea, DC. 

 Stepbauomeria miuor, Nutt. 

 Xemaeladu.s ramosissimus, Nutt. 

 Plautaiio iiata.^ouica. Jacq. var. 

 Cbilo])sis liuearis. D C. 

 Martyiiia arcnaria, Engel. 

 Mauraudia Wislizeui, Engel. 

 Peutstemou ambiguus, T. 



P. puiiiceus, Torr. 

 Castilbija atliufs, Hook. 

 Mohavea viscida, T. et G. 

 Sericosrapbis californica, Gray. 

 Hyptis Euioryi, T. et G. 

 Salazaria mexicana, Torr. 

 Tetracb^a (Joulterl, Gray. 

 Ticiuilia brevit'olia, Nutt. 

 Eritricbium luicrautbum, Torr. 

 Pectucarya liuearis, DC. 

 Aiusincbia spectabilis, Fiseh. et 



Mey. 

 Epliedra antisypliilitica, Borland. 

 Juuii)! rus tetiag-ona» Schl. 

 J. occidoutatalis, Hook. 

 Agave auicricana, L. 

 A. lechen-uilla, Torr. 

 A. fiemiiiitlora, Gawl. 

 A. pai-vitiora, Torr. 

 Dasylirion <n'aminifolium, Zuee. 

 U. Bigelovii, Torr. 

 Hesperocallis luidulata, G. 

 Yucca anguatifolia, Pih. 



