Text-book of structural and physiological botany . Fig. ^S3—Cycas circinalis, a Cycad (greatly reduced). no floral envelope or perianth, but consist simply of an axis, which isin the one case densely covered with stamens, in the other case bears special Morphology and Classification, 335 Fig. 454.—Pinus sylvestris, the Scotch fir ;I. a branch (reduced) ; II. a male flower^(natura size). 336 Siritctural and Physiological Botany, the ovules. The two cotyledons are unlike in form, are connate withone another at their apex, and remain, on germination, enclosed in thealbuminous seed. The pith o
Text-book of structural and physiological botany . Fig. ^S3—Cycas circinalis, a Cycad (greatly reduced). no floral envelope or perianth, but consist simply of an axis, which isin the one case densely covered with stamens, in the other case bears special Morphology and Classification, 335 Fig. 454.—Pinus sylvestris, the Scotch fir ;I. a branch (reduced) ; II. a male flower^(natura size). 336 Siritctural and Physiological Botany, the ovules. The two cotyledons are unlike in form, are connate withone another at their apex, and remain, on germination, enclosed in thealbuminous seed. The pith of some species, as the East Indian Cycascircinalis^ and the South African Encephalartos lanuginosus^ afford akind of s^go. [Principal genera: Cycas, Stangeria, Dioon, Encephalartos,Zamia.\ Order 2. Conifers. Trees or shrubs, with stems growing at theirapex for not unfrequently several centuries, and attaining a height of200 or 300 feet or more. Either all the leaves have the form of foliage-leaves, as in Juniperus and Thuja, or foliage-leaves alternate withmembranous scales which serve to protect the buds, as in the leaves are small, usually acerose (Fig. 454), and endure for severalvears, and the plants are therefore evergreen. The flowers are alwaysincomplete (with
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