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28 results for “Rachis”
FIGURE 2. Rhipidocladum arenicolum. A. Culm node with branch complement showing apsidate branching, B. Caryopsis, C. Floret showing persistent rachis internode, D. Branchlet bearing terminal synflorescence, E. Spikelet, F. Gynoecium, G in Three new species of Rhipidocladum (Poaceae: Bambusoideae: Arthrostylidiinae) from South America
FIGURE 2. Rhipidocladum arenicolum. A. Culm node with branch complement showing apsidate branching, B. Caryopsis, C. Floret showing persistent rachis internode, D. Branchlet bearing terminal synflorescence, E. Spikelet, F. Gynoecium, G. Node of geniculate synflorescence with pulvinus, H. Anther, I. Foliage leaf ligular area. Illustration by Eric Small based on Luteyn et al. 15520.
FIGURE 1. A. Flowering branch. B. Stipels and rachis showing double indumentum. C. Bracteole. D. Calyx, ventral view. E in A new species of Deguelia (Leguminosae, Papilionoideae) from the Brazilian Amazon Basin
FIGURE 1. A. Flowering branch. B. Stipels and rachis showing double indumentum. C. Bracteole. D. Calyx, ventral view. E. Petals, ventral view (standard, wings and keel petals). F. Pedicel and pistil. G. Staminal tube, longitudinally opened. Scale bars A: 4 cm; B: 4 mm; C: 1 mm; D–G: 2 mm. A: drawn from M.N. da Silva 12 et al. (INPA); B: drawn from C.A.C. Ferreira 5444 (HRCB); C–G: C.A.C. Ferreira 5444 (INPA).
FIGURE 3. Coccothrinax landestoyii. A. Habit, stems solitary. B. Inflorescences arching amongst the leaves, with few partial inflorescences along the rachis. C. Fruits with smooth surfaces. D in Five new species of Coccothrinax (Cryosophileae, Coryphoideae, Arecaceae) from Hispaniola
FIGURE 3. Coccothrinax landestoyii. A. Habit, stems solitary. B. Inflorescences arching amongst the leaves, with few partial inflorescences along the rachis. C. Fruits with smooth surfaces. D. Seed (viewed from top) with lobed surfaces, the lobes running from base of seeds approximately to equator. Images by M. Landestoy.
FIGURE 1. Polystichum lionelii. A. Habit. B. Petiole. C. Rachis. D in Polystichum lionelii (Dryopteridaceae), a new Andean species from northwestern Argentina
FIGURE 1. Polystichum lionelii. A. Habit. B. Petiole. C. Rachis. D. Pinnule (adaxial side). E. Pinnule (abaxial side). Drawn from F. Serapio 120 (holotype MCNS) by Lelia Bordón.
Data from: Mid-Cretaceous amber inclusions reveal morphogenesis of extinct rachis-dominated feathers
<p>We describe three-dimensionally preserved feathers in mid-Cretaceous Burmese amber that share macro-morphological similarities (e.g., proportionally wide rachis with a "medial stripe") with lithic, two-dimensionally preserved rachis-dominated feathers. These feathers in amber reveal a unique ventrally concave and dorsoventrally thin rachis, and a dorsal groove (sometimes pigmented) that we identify as the "medial stripe" visible in many rachis-dominated rectrices of Mesozoic birds. The distally pennaceous portion of these feathers shows differentiated proximal and distal barbules, the latter with hooklets forming interlocking barbs. Micro-CT scans and transverse sections demonstrate the absence of histodifferentiated cortex and medullary pith of the rachis and barb rami. The highly differentiated barbules combined with the lack of obvious histodifferentiation of the barb rami or rachis suggests that these feathers could have been formed without the full suite and developmental interplay of intermediate filament alpha keratins and corneous beta-proteins that is employed in the cornification process of modern feathers. This study thus highlights how the development of these feathers might have differed from that of their modern counterparts, namely in the morphogenesis of the ventral components of the rachis and barb rami. We suggest that the concave ventral surface of the rachis of these Cretaceous feathers is not homologous with the ventral groove of modern rachises. Our study of these Burmese feathers also confirms previous claims, based on two-dimensional fossils, that they correspond to an extinct morphotype and it cautions about the common practice of extrapolating developmental aspects (and mechanical attributes) of modern feathers to those of stem birds (and their dinosaurian outgroups) because the latter need not to have developed through identical pathways.</p>
FIGURE 3. Calanthe tsiana. A. Flowering plant. B. Rachis. C. Flower front view. D in Calanthe tsiana, a new orchid species from China (Epidendroideae: Collabieae): evidence from morphological and molecular analyses
FIGURE 3. Calanthe tsiana. A. Flowering plant. B. Rachis. C. Flower front view. D. Flower.
Data from: Mid-Cretaceous amber inclusions reveal morphogenesis of extinct rachis-dominated feathers
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Efficacy and Safety of Intravenous Lidocaine Versus Placebo in Patients Receiving Morphine-rachi Analgesia
ClinicalTrials.gov study NCT07076641. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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