Category: R
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Retrorsely
Turned backward, turned downward.
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Retrorse
Said of marginal spines, barbs, stem hairs or any protuberances that are bent abruptly backward or point towards the proximal part of the organ. Abruptly pointing downwards or backwards, especially used for prickly leaf margins and barbs.
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Retinacle, retinaculum
(In Apocynaceae) the zone by which the anthers adhere to the style head or stigma; (In Orchidaceae) the gland attached to the pollinia (more correctly called the viscidium); Outgrowth of seed funicle which holds the seed to the fruit (as in Acanthaceae). A band of tissue which holds a structure in place, as found in…
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Reticulum
Network of veins. A series of small fibres or tubes forming a network. Network, especially of blood vessels or tubules.
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Reticulodromous
(Of venation) with a single main vein, the secondary veins running towards the margin, branching again and again and becoming minute, indistinct and net-veined near the margin; like cladodromous, but with the veins less distinct near the margin.
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Reticulate
Net-veined, when the smallest veins of a leaf are inter-connected like the meshes of a net; (Taxonomic relationship) complex and many-stranded; (In pollen) with a network of ridges and empty spaces in between. A pattern which arises like a net-work. Netted with regular slightly elevated lines. (Of stem surface or spores) Marked with a raised…
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Retained
(In nomenclature) name or epithet whose use is continued.
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Resupinate
(Of flowers) upside down, or seemingly so. Inverted because of a 180 degrees twist in a petiole or pedicel. (Of fruit body) Lying flat, crus-tlike on substrate with hymenium facing outward, lacking a stem or well-defined cap. Often in reference to flowers of Orchidaceae in which the lip is lowermost, achieved by twisting or bending…
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Resinous
With the scent or consistency of resin. Containing resin.
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Resin thread
Elastic, sticky threads apparent upon breaking a leaf or petiole and pulled between the broken parts.