CONTRIBUIIONS lO WESTERN il'.i'l'ANY NO. 16 fj 



which separata .ta from the School group. In m§' 



trip into Arizona in September I found a Yucca abounding on the plains eas» 

 of Tucson, and out of flower or fruit which had leaves somewhat yellowish 

 or glaucous, and with fine threads on I aich I wondered 



ii it could be a low elevation form of Schottii. This must be the real macro- 

 carpa of Torrey. The leaves of this plant are distinctly shorter than Mohav- 

 ensis, and much thinner and le^ riirid tl .; rl -;:.. r.~. I he thick and very 

 rigid leaves of MohavensN and baccata are very marked from any other 

 Yucca. I am not in a position to say the last word on this species till I have 

 made another trip through Arizona and X>\v Mexico to Texas. 



Yucca Schottii var. valida ( Uraiulegce). Yucca valida Brandegee. I 



which is a species with pendent infiore.- 'ease erects into 



the genus Samuela, and which does not grow on the Pacific slope apparently. 



Yucca elata is a eh; racten>ti< sj>e< ies of the Arizona plains, and is the 

 eastern representative of V. Whipplei la plant without fleshy pods). This 

 then takes care of all the u-vml \tuoi, of Ariar,. o . jn a ngustissima, and 

 possibly glauca, both of which belong to the dry and erect pod section. 

 Fleming says he has seen the true baccata south of the San Quentin Bay of 

 Lower California. I am of the opinion that it goes over from the La Sal 

 mountains, Utah, to Albuquerque and possibly farther southeast into Texas. 

 Baccata does r< ntains, Califor- 



nia )havensis. 



Canotia holacantha Torrev Pac. R. R. Rep. 4 68 and Bot Ives, also 

 figured in Wheeler's Rep. 81 t I. Whether this and Holacantha Emorvi 

 Gray can belong to the same family (as done by Robinson Syn. Fl. 379) 

 the Simarubiacae is to my mind a big query. Wheeler put it in the Ruta- 

 ceae. Holacantha is not well figured in the Mex. Bound 45 fig. 8. The 

 ovary splits early into 5 carpels which are obliquely elliptical (Robinson 

 calls them "ovoid") with sharp and triquetrous inner face and ridged along 

 the suture, and either triquetrous or obvoid in cross section, and often with a 

 sharp outer ridge, and nut-like, and very bony in texture, the whole very 

 different in appearance from Canotia. But the plants of the two species 

 have the same habit except that Canotia seems always to grow on ridges 

 while Holacantha prefers dry washes, and I have aever seen it growing on 

 ridges. To look at, the plants seem I 0| being green 



throughout to the main trunk, whose bark is brown like that of Quercus 

 Gambeln Both genera have the twigs erect and close-pressed to the main 

 stem. Holacar, aose and sharp, 



making it difficult to get specimens of the flowers and fruit. But when you 

 approach Canot ^ ^ and eyen 



when spina* the spines are short and tin aher soft. The 



fruits of the two genera are conspicuously diffi n at. ( \ notia has an ellipti- 

 cal fruit fully half an inch long (with round cross section) and ending in a 

 long and fleshy beak The outer part of the fruit is pulpy and soft and cuts 

 easily, and when fully ripe splits into 10 subulate tipped sections, each 

 suture splitting into two. The pods are erect and single. I found it grow- 



