. Plants and their uses; an introduction to botany. Botany; Botany, Economic. 380 VARIOUS PLANT (iROUPS Fig. 299, I.âFlower of Oxeye (Heliopsis scahra, Sunflower Family, Compositce). A-N, stages in the development of a tubular floret, enlarged. .4, very young stage in whirh tlie flower (fl) is as yet with- out petals but is plainly dis- tinguishable from its bract (6). B, shows the ringlilie swelling {/c) which represents the calyx, and five knoljs (c) which are the beginnings of petals. C, a somewhat more advanced stage, just before the appearance of stamens. D, showing the stamens (a) just a
. Plants and their uses; an introduction to botany. Botany; Botany, Economic. 380 VARIOUS PLANT (iROUPS Fig. 299, I.âFlower of Oxeye (Heliopsis scahra, Sunflower Family, Compositce). A-N, stages in the development of a tubular floret, enlarged. .4, very young stage in whirh tlie flower (fl) is as yet with- out petals but is plainly dis- tinguishable from its bract (6). B, shows the ringlilie swelling {/c) which represents the calyx, and five knoljs (c) which are the beginnings of petals. C, a somewhat more advanced stage, just before the appearance of stamens. D, showing the stamens (a) just appearing. E, ^ same stage as D, cut vertically. F, later stage in which the beginnings of two carpels (e) appear. G, same stage, viewed from the side, show- ing that the petals or corolla lobes have curved inward protectively and are united below by a ring of tissue wlfjch by upward growth be- comes the corolla-tube bear- ing the five lobes above. H, same stage, cut vertically; showing the upward growth of the carpels (g) leaving a hollow in the stem-tip (torus). J, later stage, cut verticall>- through the middle of the carpels (g) showing a deepen- ing of the hollow in the torus. K, bud of mil Idle age, show- â¢â ing the corolla-tube (c) with its five lobes well developed, and lower part of the pistil ((7), enveloped by the torus, becoming plainly distinct as an "inferior ; L, a somewhat later stage, cut ver- tically, showing the appear- ance of two styles (s), still dis- tinct, and a young ovule (a) with its outer coat half-grown. Al, bud almost ready to open; the two styles having grown into one {s); the anthers {a) joined into a tube; the sepals (k) distinct prominences on the top of the torus, a nectar- gland (ri); and the ovule (o) completely formed. A^, Tubular floret, open, showing anther-tube (a), corolla-tube (c), and inferior ovary (g). OS, stages in the growth of a ray-floret. 0, ver>' earl^- stage in which five petal-lobes appear, three of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
