File:The natural history of plants, their forms, growth, reproduction, and distribution; (1902) (14596738319).jpg

Identifier: naturalhistoryof01kern (find matches)
Title: The natural history of plants, their forms, growth, reproduction, and distribution;
Year: 1902 (1900s)
Authors: Kerner von Marilaun, Anton, 1831-1898 Oliver, Francis Wall, 1864- Macdonald, Mary Frances Ewart Busk, Marian Balfour, Lady
Subjects: Botany
Publisher: London, Blackie
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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le, which at its blind end is enlargedinto a bladder, whilst at the narrow orifice at the opposite end are placed twopeculiar ribbon-shaped processes twisted spirally. The orifice of the utricle is set withvery small sharp teeth bent inwards; and the tubular part of the utricle has itsinner surface lined throughout with innumerable little bristles, which arise from rows PLANTS WITH TRAPS AND PITFALLS TO ENSNARE ANIMALS. 125 of cells forming inwardly projecting ridges, and have their sharply-pointed tipsdirected downwards (see fig. 19 i). Amongst these needles are also found, scatteredover the whole internal surface, roundish wart-like glands or papillae, composed offour or eight cells. The bottom of the bladder-like cavity in which the utricleterminates is destitute of bristles, and provided only with glands arranged in rows.Small worms, mites, and other segmented animals which enter through the orificeof the utricle can easily reach the enlarged base. But as soon as tliey try to com-
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Fig 20 —Sarracenia pxirpui mence the return journey they are opposed by the points of a thousand bristles^Thus caught they die, and the products arising from the decay of their bodies areabsorbed by the glands situated, as above mentioned, at the bottom of the bladderand on the walls of the utricle. As types of a second series of carnivorous plants belonging to the group ofpitcher-plants may be taken Heliamphora nutans, a native of moorlands on themountains of Roraima, on the borders of British Guiana, and Sarracenia purpurea(see fig. 20), which is widely distributed in the marshes of eastern North Americafrom Hudsons Bay to Florida. In both instances the leaves metamorphosed intoascidia are arranged in rosettes, rest their bases on damp earth and thence curveupwards. They are somewhat inflated, like bladders, at about their middle, butcontract again at the orifice where they pass into the relatively small laminjB.The latter are threaded by red streaks like blood-vessels, have the f

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