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Morphological and Cytological Studies of Calla palustris

Margaret G. Dudley
Botanical Gazette
Vol. 98, No. 3 (Mar., 1937), pp. 556-571
Stable URL: http://www.jstor.org/stable/2471544
Page Count: 18
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Morphological and Cytological Studies of Calla palustris
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Abstract

1. Calla palustris spreads over the ground by means of an alternately branching sympodial rhizome, which bears numerous adventitious roots at the nodes. 2. Each growing point is active for two seasons, producing several leaves the first year and two more the next spring, followed by an inflorescence, which terminates the growth of that branch of the rhizome. 3. Each principal plant axis is continued by the production of a branch in the axis of the penultimate leaf of the flowering rhizome. 4. The leaves are thin, bright green, and cordate, with ligulate sheathes. Their vernation is convolute, and they are rolled to right and left alternately. 5. The ovary is unilocular, and contains from two to fourteen anatropous ovules. Double ovules, fused longitudinally, sometimes occur. 6. A periplasmodium is formed in the anther. The pollen grains are apparently trinucleate before dehiscence occurs. 7. The seed is albuminous, and possesses a hard seed coat. The embryo is central, and germinates without a period of rest if the seed has been thoroughly dried. 8. Germination is hypogeal. The base of the cotyledon elongates, forcing the radicle and plumule down into the substratum. The cotyledonary slit is edged by a collar, through which the plumule emerges. The vascular strands of the cotyledon are three in number, and do not traverse the collar. 9. The primary root sometimes develops, but more often does not, when its place is taken by an adventitious one. This adventitious root is very noticeable, even before germination. 10. The leaves of the young seedling have no ligular sheath, but resemble adult leaves in all other particulars. 11. The haploid chromosome number, as determined from pollen mother cells at metaphase I, is 18. Metaphase plates of root tips show 36 chromosomes.

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