. Botany for academies and colleges: consisting of plant development and structure from seaweed to clematis. Botany; 1889. APETAL^. 67 LESSON XI. Sub-Class II. Exoqens. Dicotyledons. {1. Apetalse, no petals. 2. Monopetalie, one-petalled. 3. Polj/petalx, many-petalled. 92, 93. Apetalse, Ovary Adherent: Mistletoe. 94. Oaks. 95. Wal- nuts. 96. Eafflesia. 97. Ovary Free: Catkin-bearers. 98. Nettle to Amaranth. 99-103. Monopetalie, Ovary Free : Mint to Heath. 104 105. Ovary Adherent: Harebell to Honeysuckle. 106. Number Five! 92. Division I. Apetalae.—Two Subdivisions: (1) Ovary Adherent; (2) Ovary
. Botany for academies and colleges: consisting of plant development and structure from seaweed to clematis. Botany; 1889. APETAL^. 67 LESSON XI. Sub-Class II. Exoqens. Dicotyledons. {1. Apetalse, no petals. 2. Monopetalie, one-petalled. 3. Polj/petalx, many-petalled. 92, 93. Apetalse, Ovary Adherent: Mistletoe. 94. Oaks. 95. Wal- nuts. 96. Eafflesia. 97. Ovary Free: Catkin-bearers. 98. Nettle to Amaranth. 99-103. Monopetalie, Ovary Free : Mint to Heath. 104 105. Ovary Adherent: Harebell to Honeysuckle. 106. Number Five! 92. Division I. Apetalae.—Two Subdivisions: (1) Ovary Adherent; (2) Ovary Free. Subdivision I. Ovary Adherent. — Among the lowest Orders here we see the Mistletoe (Fig. 65). The flowers are always diclinous and often dioecious. They have no pet- als, but a flower-like calyx. The ovule is without tegmen, or testa; it consists of the nucleus alone, and is often re- duced to the embryo-sac, its only pro- tection being the ovary, wliich is ad- herent. And since the condition of the embryo is the basis of classification (31), this Order ranks lowest in Dicotyledons. The female flower has 1 style, a 1-celled ovary, and a 1-seeded fruit. 93. We know that the Mistletoe is a parasite. Botanists suppose that long ago—it may have been hundreds of thousands of —it was a climbing shrub, with roots in the ground, and ascending trees by means of secondary roots like the Ivy. But the underground root and the lower part of the stem perished in the race for life; and this strange creature of a prehistoric time lives on as a true parasite. It sends its roots into the wood of its host, and incorporates them so completely that they cannot be distinguished from the fibre of the tree. It also adapts its seeds to its condition: each seed usually has two embryos (Pig. 65, C); these protrude from a nucleus without seed-coats; and the ripe berry (pericarp) is so viscid that the seeds cannot fail of a foothold on the host on which they grow, or to which they may
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