phloem absent

Listing 1 - 8 from 8 for phloem absent

Angiosperm Families - Implicit Attributes
... without etherial oil cells; not containing mucilage cells; without sclerenchymatous idioblasts. Stem anatomy. The cortex without cristarque cells. Cortical bundles absent. Medullary bundles absent. Internal phloem absent. The secondary phloem not stratified. Xylem without tracheids; without fibre tracheids; without libriform fibres; with vessels. Tile cells absent. Pith without diaphragms. Root ...
delta-intkey.com

Angiosperm Families - Acanthaceae Juss.
... bundles present (rarely), or absent. Internal phloem present, or absent. Secondary thickening developing from a conventional cambial ring. ‘Included’ phloem absent. Xylem with fibre tracheids; with libriform fibres; with vessels. Vessel end-walls simple. Vessels without vestured pits. Primary medullary rays narrow. Wood diffuse porous; not storied; parenchyma paratracheal. Reproductive type, ...
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APSnet Education Center - Introductions to the Major Pathogen Groups - Introduction to Parasitic Flowering Plants
... of their own food through photosynthesis. Indeed, it has been documented that leafy mistletoes such as Phoradendron actually translocate photosynthates back into the host during the winter when host leaves are absent. In contrast, Arceuthobium (dwarf mistletoe) produces very little of its own food as an adult plant. Figure 51. Figure 52. Figure 53. Figure 54. Complex types of haustoria are found ...
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Bananas and plantains
... from "Cavendish" stock. In Central America, 'Gros Michel' and 'Poyo' Cavendish were wiped out virtually overnight by Panama disease, a fungus (Fusarium oxysporium cubense), which attacks the phloem. Fortunately, some banana clones showed resistance in the field, and growers reestablished plantations with those plants. Now the Jamaican clone 'Valery' (a robust Cavendish banana) is what is grown ...
www.botgard.ucla.edu

MBG: Research: Projects: South America: Venezuelan Guayana
... 39(33). Stem cross section with 8-16 phloem arms; capsule with midline barely or not at all evident; seeds with brownish wings; interpetiolar glandular fields absent ..... 40 39. Stem cross section with 4 phloem arms; capsule with raised midline; seeds with the wings (except Paragonia) usually hyaline-membranous or absent; interpetiolar glandular fields present or absent ..... 41 40(39). Capsule ...
www.mobot.org

Pinus contorta Dougl
... locally (37). Serotinous cones are not common in eastern Oregon, rare in coastal populations, and absent in the Sierra Nevada and southern California and Baja California populations (20). Although common in ... in July or August, introducing bluestain fungi (8). The beetles construct egg galleries in the phloem where larvae feed and together with the fungi, girdle and kill the tree. Larvae overwinter ...
www.na.fs.fed.us

Ceitis occidentalis L
... it is restricted to well-developed river valleys, north slopes, and protected ravines, and it is largely absent from windswept parts of the western river valleys. It is common in eastern Iowa on all ... is unique, along with a few other genera, in that a primary structure of the root phloem is stereome (sclerenchyma and collenchyma collectively). Stereome seldom develops in roots and when present is ...
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Chapter 3: Taxonomy, Page 1
... solitary-prismatic (or as crystal sand). Minor leaf veins without phloem transfer cells (Chamaerops). Vessels present; end-walls scalariform. Stem anatomy. Secondary thickening absent (or slight, and then not cambial but from ... absent (rarely); 6 (usually), or 4, or 4-9 (rarely, when spiral); free, or joined; 2 whorled (usually 3+3, occasionally 2+2), or 1 whorled (rarely); isomerous (but the two ...
www.plantapalm.com