640 Part. IV. Chapter 5. 
peculiar t0 Magdalena and Santa Margarita Island are Gongylocarpus 
Fruticulosus, Mamillaria Halei, Agave Margaritae, Brickellia hastata, Viguiera 
subincisa. — Cedros (Cerros) Island is the largest of the Mexican coast 
islands. Here grow Pentstemon cedrosensis, Mentzelia cordata, Gilia Veatchi, 
Harfordia fruticosa. On the slopes of the mountain are found such shrubs 
as Mimulus glutinosus, Sphaeralcea fulva, Oenothera arborea and Juniperus 
cerrasianus, while the mountain summit is adorned with open groves of Pinus 
muricata associated with Arctostaphylos bicolor, Eriogonum molle and Senecio 
cedrosensis. The elephant tree inhabits all parts of the island, but more espe- 
cially the arroyos or ravines. In all 135 species of plants are known from this 
island and many of them are peculiar. 
e San Benito islands lie seaward some twenty miles west of Cedros Island and con- 
sist of three islets. Only a limited number of plants are known from the islands and comparing 
Eschscholtzia ramosa Greene. Atriplex deltata Greene. Perityle Greenei Rose. 
Lepidium lasiocarpum Nutt. 
Lavatera venosa Wats. 
Mamillaria Goodrichii Scheer. 
Mesembryanth. cerystallinumL. 
Krynitzkia maritima Greene, 
ambigua A. Gray. 
> 
Trixis angustifolia DC. 
Lyeium californicum Nutt. 
Plantago patagonica Jacq. 
Mirabilis californica A. Gray. 
Brodiaea capitata Benth. 
Frankenia Palmeri Wats. 
Hosackia maritima Nutt. ; 
Cotyledon linearis Greene, Hemizonia Streetsii A. Gray. 
Euphorbia benedicta Greene. Amblyopappus pusillus Hook. 
Calandrinia maritima Nutt. & Arn. ’ 
2. Western Sierra Madre Region. 
The mountains of this region run in a general northwest and southeast 
direction, but are not a uniform chain, being broken into a confused mass of 
peaks and ranges separated from each other by deep valleys and impassable 
canyons and barrancas. 
Formations in Central Sierra Madre Mountains. Journeying on 
the pine clad highlands, the traveller finds nothing to remind him that he is 
in southern latitudes except an occasional glimpse of an Agave between the 
rocks and the rarer cactaceous species. Species of Opuntia, Echinocactus and 
Mamillaria are found here and there, büt form no conspicuous feature in the 
higher altitudes of the sierra. 
ı. Hills. and Table Lands, 
Pine-Oak Forest Formation. The hills and table lands are pine covered 
at an approximate elevation of 7,400 feet. The Pine forests form a pure growth 
of an open character, but here and there are cClumps of scrub oak, composed 
1) GREENE, E. L.: See Bibl, p- 83. I: 261; VAsEY, G. and Rose, J- N.: San Benito Isl. 
Pl.: See p. 86. 
