NOTE: We only request your email address so that the person you are recommending the page to knows that you wanted them to see it, and that it is not junk mail. This benefit for palmate venation is consistent with its repeated evolution and its biogeographic and habitat distribution. Leaf venation is the pattern in which leaf veins are organized. reticulate - venation. Parallel veins are all running parallel to each other. The ability to maintain stomatal conductance at the proximal (A) and at the distal (B) halves of the leaf relative to untreated leaves (shown schematically for leaves of A. saccharum and Q. rubra, examples of palmately and pinnately veined leaves, respectively), and the ability to maintain whole-leaf hydraulic conductance (C) were related to the primary vein density (r Leaf Venation There are two subtypes of venation, namely, craspedodromous , where the major veins stretch up to the margin of the leaf, and camptodromous , when major veins extend close to the margin, but bend before they intersect with the margin. We found that palmately veined leaves tolerate midrib damage, as can be inflicted generally by insects in several orders, which have converged on this behavior as part of feeding (e.g., 29, 30, 33, 46). venation. To test the physiological impact of each treatment, we first analyzed data for given lamina locations for all species of each leaf type together by using repeated-measures ANOVAs (using GenStat 9th edition, VSN International; factors species × treatment; 87–89), comparing treatment with matched control leaves. palmate leaf synonyms, palmate leaf pronunciation, palmate leaf translation, English dictionary definition of palmate leaf. leaf for any of the species tested (SI Fig. Some species can compensate for partial leaf damage through increased photosynthetic rate in the lamina surrounding the damage (30, 47); other species experience reduced photosynthetic rates in surrounding lamina (48); and yet other species, including those in this study, show only minor effects immediately adjacent to the removed lamina (22, 29, 41, 42). The arrangement of veins in a leaf is called the venation pattern. Coevolutionary theory would predict that vein redundancy, by contributing to insect tolerance, might itself promote diversification (76, 77). We found a similar correlated decline of g and K Examples include maple … ). The impact of midrib damage in a pinnately veined leaf would depend on the distance along the midrib at which severing takes place. Additional investigation is needed of the costs and effectiveness of these alternatives for protecting the leaf. 5 A–C Even in tropical floras, palmate venation tends to occur in pioneer species with relatively thin, large, short-lived leaves that also tend to be exposed to insect damage, high-evaporative loads, and potential leaf desiccation as juveniles (56). For palmately veined species the reduction of g depended strongly on location (species effect, P = 0.399; location effect, P < 0.001; species × location, P = 0.351); there was no impact at the marginal lobes and a significant although relatively weak reduction of g in both central lamina locations (species P < 0.001 and treatment P ≤ 0.006 for the central lamina locations, P = 0.548 for the marginal lobe; species × treatment interaction, P = 0.118–0.76; df = 84–85). leaf ranging from 43% ± 4.2% for K. latifolia to 90% ± 1.7% for Q. rubra (paired t tests, P ≤ 0.001; n = 5–8), a reduction in K Within each leaf, the vascular tissue forms veins. What is a leaf? 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