- primary thickening meristem
- Diffuse primary meristem which decreases in cross-sectional extent (i.e. becomes a thinner-walled cylinder) in a basipetal direction (DeMason, 1983).
Expanded glossary of Cycad terms . 2014.
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angiosperm — /an jee euh sperrm /, n. Bot. a plant having its seeds enclosed in an ovary; a flowering plant. Cf. gymnosperm. [ANGIO + SPERM] * * * ▪ plant Introduction any member of the more than 300,000 species of flowering plants (division Anthophyta) … Universalium
Secondary growth — In many vascular plants, secondary growth is the result of the activity of the vascular cambium. The latter is a meristem that divides to produce secondary xylem cells on the inside of the meristem (the adaxial side) and secondary phloem cells on … Wikipedia
cycadophyte — ▪ plant Introduction any member of a diverse collection of mostly extinct primitive gymnospermous plants. They probably had their origins among the progymnosperms of the Devonian Period (416 to 359 million years ago), possibly among a… … Universalium
Cycadales — Gymnosperm plant order containing all extant and extinct cycads; defined by the absence of axillary buds and the presence of cycasin, girdling leaf traces, simple megasporophylls, and primary thickening meristem which gives rise to the… … Expanded glossary of Cycad terms
REFERENCES — ■ Bonta, M., O. Flores Pinot, D. Graham, J. Haynes & G. Sandoval. 2006. Ethnobotany and conservation of tiusinte (Dioon mejiae Standl. & L.O. Williams, Zamiaceae) in northeastern Honduras. Journal of Ethnobiology 26:228 257. ■ Cactus Art.… … Expanded glossary of Cycad terms
Asparagales — ▪ plant order Introduction the Asparagus or orchid order of monocotyledonous (monocotyledon) flowering plants, containing 16–24 families, 1,122 genera, and more than 26,000 species. Asparagales contains many garden plants and several types of… … Universalium
plant development — Introduction a multiphasic process in which two distinct forms succeed each other in alternating generations. One form, created by the union of sexual cells (gametes (gamete)), contains two sets of similar chromosomes (diploid). At sexual… … Universalium
tree — treelike, adj. /tree/, n., v., treed, treeing. n. 1. a plant having a permanently woody main stem or trunk, ordinarily growing to a considerable height, and usually developing branches at some distance from the ground. 2. any of various shrubs,… … Universalium
Tree — /tree/, n. Sir Herbert Beerbohm /bear bohm/, (Herbert Beerbohm), 1853 1917, English actor and theater manager; brother of Max Beerbohm. * * * I Woody perennial plant. Most trees have a single self supporting trunk containing woody tissues, and in … Universalium
Root — This article is about the part of a plant. For other uses, see Root (disambiguation). Primary and secondary roots in a cotton plant In vascular plants, the root is the organ of a plant that typically lies below the surface of the soil. This is… … Wikipedia