. Botany of the living plant. Botany. APPENDIX A 529 beyond the curved stamens, thus there is a probabUity of cross-polUnatiou from visits from humble-bees, but the flower is not highly specialised. (37) The Potato {Solanum tuberosum, L.) is an herbaceous plant that reproduces itself by tubers (Fig. 138, p. 185). But it commonly flowers also in cymose inflorescences, which are without bracts. The flowers of the cultivated varieties are apt to show abnormalities. The normal structure is • Solattinn luberosinii. I. flower. IT. pistil, and persistent calyx. III. stamen with porous dehisrence.
. Botany of the living plant. Botany. APPENDIX A 529 beyond the curved stamens, thus there is a probabUity of cross-polUnatiou from visits from humble-bees, but the flower is not highly specialised. (37) The Potato {Solanum tuberosum, L.) is an herbaceous plant that reproduces itself by tubers (Fig. 138, p. 185). But it commonly flowers also in cymose inflorescences, which are without bracts. The flowers of the cultivated varieties are apt to show abnormalities. The normal structure is • Solattinn luberosinii. I. flower. IT. pistil, and persistent calyx. III. stamen with porous dehisrence. JY. seed in median section. \'. floral diap:ram. like Alropa in number and arrangement of parts. But the corolla is wheel- shaped, and expanded in a vertical plane, while the five projecting stamens open by terminal pores {Fig. 435). The stigma projects beyond them. There is no honey-secretion. The native habitat is South America. The arrangement of the flower might lead to crossing if the suitable insects were present, but here insects rarely visit the flowers. Self-polUnation is possible, and fruit is often set. The fruit is a berry. ORDER : PERSONATAE. Family : Scrophulariaceae. Examples : Figwort, Speedwell. (38) The Figwort (Scrophularia nodosa, L.) is a common plant of moist soil, wath upright four-angled stems bearing decussate leaves, and terminating in lax cymose panicles' of tawny purplish flowers. They are zygomorphic, and strongly protogynous (Fig. 436). Each flower consists of : Calyx, sepals 5, slightly gamosepalous, inferior. The odd sepal is posterior. Corolla, petals 5, gamopetalous, inferior ; two-lipped. Androeciim, stamens 4, epipetalous ; the fifth posterior stamen represented by a prominent staminode below the upper lip. Gynoeciiim, carpels 2, sjmcarpous, superior,antero-posterior; style elongated sti'^ma capitate. Ovarj- bilocular, mth numerous o-\-ules on an enlarged axile placenta. A yellow hone3'-disc surrounds the base of the ovary. Fruit a dry cap
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
