Results 61 to 70 of about 268,596 (371)
Nature, 1958 The Book of Flowering Trees and Shrubs By Stanley B. Whitehead. Pp. 244 + 63 plates in colour. (London and New York: Frederick Warne and Co., Ltd., 1956.) 15s. net.
openaire +2 more sources
American Journal of Botany, EarlyView.Abstract Premise Araliaceae comprise a moderately diverse, predominantly tropical angiosperm family with a limited fossil record. Gondwanan history of Araliaceae is hypothesized in the literature, but no fossils have previously been reported from the former supercontinent.
Peter Wilf
wiley +1 more source
Some classical model theoretic aspects of bounded shrub-depth classes [PDF]
arXiv, 2020 We consider classes of arbitrary (finite or infinite) graphs of bounded shrub-depth, specifically the class $\mathrm{TM}_{r, p}(d)$ of $p$-labeled arbitrary graphs whose underlying unlabeled graphs have tree models of height $d$ and $r$ labels. We show that this class satisfies an extension of the classical L\"owenheim-Skolem property into the finite ...
arxiv
Kernelizing MSO Properties of Trees of Fixed Height, and Some Consequences [PDF]
Logical Methods in Computer Science, Volume 11, Issue 1 (April 1,
2015) lmcs:748, 2012 Fix an integer h>=1. In the universe of coloured trees of height at most h, we prove that for any graph decision problem defined by an MSO formula with r quantifiers, there exists a set of kernels, each of size bounded by an elementary function of r and the number of colours. This yields two noteworthy consequences.
arxiv +1 more source
, 2003 The purpose of this resource is to observe plant green-down and report greendown data to help validate estimates of the end of the plant growing season. Students monitor the change in color of selected leaves of trees, shrubs or grasses.
The GLOBE Program, University Corporation for Atmospheric Research (UCAR)
core
Landscapes and forest flora of al-Andalus: a reconstruction from textual historical documentation
Mediterranean Botany, 2019 The translation and interpretation of works by Andalusi botanists and agronomists provide an increasingly sharp image of the species and forest landscapes in al-Andalus (Iberian area under Muslim rule in the Middle Ages).
J. Esteban Hernández Bermejo +3 more
doaj +1 more source
American Journal of Botany, EarlyView.Abstract Premise Amphistomy, the presence of stomata on both leaf surfaces, can increase photosynthesis yet is uncommon across vascular plants. The relative infrequency of amphistomy is often attributed to high costs, such as transpirational water loss.
Genevieve Triplett, Aaron S. David
wiley +1 more source
Environment Conservation Journal, 2014 Forest fires have profound impacts on physical environment including land cover, land use, forest ecosystem and biodiversity. In the present study the effect of fires on floristic composition, structure, dominance and species richness in subtropical pine
Junaid Ahmed , Sanjay Sharma
doaj +1 more source
Coffee berry borer Hypothenemus hampei (Coleoptera: Curculionidae: Scolytinae) removal in coffee plantations: a pest control service provided by birds [PDF]
, 2014 Coffee is one of the most important crops in tropical regions of the world, where areas suited for its production are usually immersed within important biodiversity conservation regions.
Avelino, Jacques +4 more
core
American Journal of Botany, EarlyView.Abstract Premise Establishment of long‐lived perennial plants is a pivotal event that often leads to reproductive maturity. The population dynamics of the giant saguaro cactus (Carnegiea gigantea) have been investigated over large spatial areas, but establishment patterns have not been studied at the microsite (1 m) scale.
Peter B. Breslin +6 more
wiley +1 more source