1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 473 



{Phoradendum Jiavescens). The Screw Bean is uo lonj?er seen. Here 

 begin the Eetama {ParJdnsonia aculeata) and Huisache [Acacia Farnesi- 

 ana), elegant trees becoming more frequent and of larger size below. 

 Common and conspicuous are the thorny, j^ellow-flowered ParMnsonia 

 Texana; the white-leaved, purple-flowered Caulophyllum Texanum; the 

 fragrant Lippia lycioides aud graveolens ; the Majorano {Salvia hallotce- 

 flora), and the Guayacan {Porliera angustifoUa). The other shrubs are: 



CalUandra conferta. 



Gastela NicJiolsoni (Goat-bush). 



^hcefferia cuneifolia. 



Bumelia lanuginosa and spinosa. 



Lantana macrocarpa and Camara. 



Diospyros Texana (Persimmon). 



Mozzina spathulata (Sangre de dragon). 



Larrea Mexicana (Creosote-bush). 



Flourensia cernua. 



I/ycium Garolinianum. 



Celtis pallida (Granjeno). 



Forestiera angustifoUa. 



Koeberlinia spinosa (Junco). 



Condalia Mexicana, obovata, spathulata. 



Coluhrina Texensis. 



Zizyphus ohtusifolius. 



The following climbers are characteristic : 



Ipomcea sinuata. 



Clematis Drummondii. 



Philihertia cynanchoides. 



Maximowiczia Lindheimeri. 



Passifiora tenuiloha andfcetida. 



Roulinia unifaria. 



Cuscuta decora. 

 In the early summer the bottom is covered with the flowers of Callir- 

 rhoe involucrata, (Enothera speciosa, tetraptera and sinuata, Anemone Ms- 

 pida (with purplish flowers), Phacelia Popei, Monarda citriodora and 

 punctata, GaiUardia pulchella, Dichetophora campestris, Helenium am- 

 phibolum and ooclinium. 



Other herbs, growing in various situations, are : 

 Neptunia pubescens. 

 Dalea lasiathera. 

 Psoralea rhonibifolia. 



Malvastrum leptophyllum, trieuspidatum, pedatifidum. 

 Sphoeralcea hastulata. 

 Melochia pyramidata. 

 Hermannia Texana. 

 Galphimia Unifolia. 



