BIO 2137 Lecture Notes - Lecture 9: Dracaena Draco, Ophrys, Sporophyll
21 Oct 2016
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Fruit = mature ovary containing the ovule transformed into seed. Distinctive life-cycle features eg. extreme reduction of the gametophyte. Ovary is multiple ovules fused together, making the fruit. Floral parts: in fours or fives (petals) (tetramerous or pentamerous) Palm that gets really fat with primary thickening meristem. Dracaena draco has true secondary growth, the only one. True secondary growth from single cambium unknown (extremely rare in roots) Ring on outside and then scattered in the inside. Bears sporophylls = modified leaves that bears sporangia. Carpels = megasporophylls, contain ovules which will develop into seeds (angeion = vessel, sperma = seeds) Inflorescence: cluster of flowers disposed in a definite pattern. Lots of tiny flowers inside the head (sunflower) Perianth (around the flower) calyx = contains sepals (usually green) Petals and sepals may be similar shapes and colours = tepals. Anther: 4 sporangia borne on a filament (look at slides)
