OF ARTS AND SCIENCES. 119 



— . Chenopodium album, Linn, Only one plant near the sea on 

 the east side. 



83. Atriplex Palmeri, Watson ; new species. (See page 146.) 

 Only at the south end, in roundish bunches, about a foot and a half 

 high. One of the three characteristic perennials of the island, much 

 more frequent than Artemisia Cali/ornica, but scarcely half so abun- 

 dant as Franseria hipinnatifidn. In flower at the end of February, 



84. Pterostegia drymarioides, Fisch. & Mey, In the shade 

 of rocks in the middle and more rarely at the south end, 



85. Phoradendron Bolleanuji, Seem. Near the south end, on 

 Juniper us and Oupressus, more frequently the former, 



86. Hesperocnide tenella, Torr. In damp shady places, among 

 high rocks, in the middle of the island. 



87. Parietaria debilis, Forst. Abundant in similar localities, 

 88 and 89. Quercus chrysolepis, Liebm. ; fide Dr. Engelmann. 



Frequent at the north end, and occasionally found in the carions on 

 both sides of the island. Often large, sometimes forty feet high, and 

 wide-spreading; timber good and durable, though knotty. 



90. PiNUS JNSiGNis, Dough, var. ; fide Dr. Engelmann ; with leaves 

 in twos. At the north end, at high elevations. Very vigorous and 

 handsome trees, usually spreading widely, the largest seven and a half 

 feet in circumference and averaging seventy feet high. The wood is 

 very knotty and soon decays. At the extreme northern end, facing 

 Espaza Bay, the trees assume a hedge-like form, owing to the force of 

 the winds. 



91. JuNiPERUS Californica, Carr., fide Dr, Engelmann, All 

 over the middle of the island and occasionally at the south end, in the 

 ravines and low valleys, forming groves about fifteen feet high. It is 

 exceedingly crooked, the timber small but very durable. As soon as 

 dead the ants take possession of it. 



92. CuPRESSUS macrocakpa, Hartvv. ? A fine widely spreading 

 tree, though varying much iu habit, growing in irregular clusters in the 

 middle of the island. It averages about forty feet in height. A tree 

 thirty-eight feet high and seven in circumference numbered 236 annual 

 rings. The largest is at the head of Landrum's Cafion, twenty-five feet 

 in circumference, dividing into seven branches at the height of two or 

 three feet, the main limb at ten feet above the forks being thirteen feet 

 around. The bark is claret-brown, shining when wet, at length crack- 

 ing irregularly and curling up in thin plates. An abundance of resin 

 is exuded, especially as the bark is eaten off by the goats. The wood 



