The chief cultivated plants are maize, the sugar-cane, tobacco, cotton, coffee and especially henequen, the so-called "Sisal hemp," which is a strong, coarse fibre obtained from the leaves of the Agave rigida, var.
Hadrian's celebrated dying address to his soul may here be quoted: "Animula vagula, blandula, Hospes comesque corporis, Quae nunc abibis in loca Pallidula, rigida, nudula; Nec, ut soles, dabis jocos?"
In Yucatan immense plantations of the Agave rigida var.
The pitch pine (Pinus rigida) is a native of Canada and is common throughout the United States of America.
Antarctica), 2 and Winter's bark (Drimys Winteri), intermingled with a dense undergrowth composed of a great variety of shrubs and plants, among which are Maytenus magellanica, Arbutus rigida, Myrtus memmolaria, two or three species of Berberis, wild currant (Ribes antarctica), a trailing blackberry, tree ferns, reed-like grasses and innumerable parasites.
The three-leaved group includes several of the most valuable trees of America; among them is P. rigida, the pitch pine of the northern states, a tree of from 40 to 50 ft.
Androgynous cones may be produced, as in the cone of Pinus rigida (fig.
In the Mediterranean region occur Cupressus sempervirens, Pinus Pinea (stone pine), species of juniper, Cedrus atlantica, C. Libani, Callitris quadrivalvis, Pinus montana, &c. Several conifers of economic importance are abundant on the Atlantic side of North America - Juniperus virginiana (red cedar, used in the manufacture of lead pencils, and extending as far south as Florida), Taxodium distichum (swamp cypress), Pinus rigida (pitch pine), P. mitis (yellow pine), P. taeda,P. palustris, &c. On the west side of the American continent conifers play a still more striking role; among them are Chamaecyparis nutkaensis, Picea sitchensis, Libocedrus decurrens, Pseudotsuga Douglasii (Douglas fir), Sequoia sempervirens, S.