annulus 2 pl. annuli |
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STRUCTURE |
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A row of protruding specialized sporangial wall cells that extends upward from the base of the sporangium and over its apex, thus forming an incomplete circumferential ring; esp. in Polypodiophyta. The inner and radial walls of the annular cells are markedly thickened and the structure functions as a spore-releasing and -disseminating mechanism as a result of differential stresses developed within the mature sporangial wall upon desiccation. |
spinulose |
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margin |
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Finely spinose. |
monochasiate |
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architecture |
inflorescence |
Comprising one or more simple or compound monochasia. See also cincinnate, cymose, cymulose, dichasiate, helicoid-cymose, scorpioid-cymose. |
oblique 1 |
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apex |
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Asymmetric about its longitudinal axis. |
membrane |
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STRUCTURE |
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A relatively thin layer of tissue that covers or separates other, different tissue(s) and/or empty space(s). |
subvalvate |
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dehiscence |
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Incompletely or partly valvate. |
disc floret |
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STRUCTURE |
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A floret that has an actinomorphic corolla, is bisexual, functionally staminate, or functionally pistillate, and is borne in a radiate, discoid, disciform, or radiant capitulum (head) interior (distal) to any peripheral series of differing florets that may be present; in Asteraceae (Compositae). |
trichotomous |
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architecture |
axis |
Branching by division of the apical meristem producing three coordinate but not necessarily equal derivatives from each division. |
basal cell |
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STRUCTURE |
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Any of the ring of cells forming the lowermost (proximal) portion of an antheridial wall. |
exsert(ed) |
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position |
anther, style |
Protruding beyond the floral envelope. See also included. |
papilla pl. papillae |
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FEATURE |
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A small, conoidal protrusion resembling a pimple. See also pustule (blister, bulla). |
unbranched 2 |
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architecture |
laminar veinlet |
Not branching within the areole. |
pilose |
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pubescence |
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Bearing relatively sparse, soft, slender, more or less erect capillate trichomes. See also pilosulous. |
bigeminate |
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architecture |
foliaceous structure |
Compound with two orders of leaflets, each order bifoliolate. |
fissured |
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relief |
bark |
Split or cracked vertically, diagonally, and/or horizontally in a regular or irregular pattern, the fissures not encircling the stem individually. |
perigynium 2 pl. perigynia |
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STRUCTURE |
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A phyllary (involucral bract) or palea (pale, palet) that fully encloses a cypsela; in Asteraceae (Compositae). |
polygamodioecious |
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reproduction |
taxon |
Basically dioecious but with some plants bearing some bisexual flowers. |
planoconcave |
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solid shape |
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Relatively thin with opposite broad faces, one plane and one concave. |
proliferous |
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reproduction |
plant, structure |
Bearing plantlets, as from the leaf margin in some Kalanchoë (Crassulaceae). |
hemispheric(al) |
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solid shape |
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Half-spheric(al); broadest at the base and uniformly rounded to the apex, circular in any transverse section, and half-circular in any median longitudinal section. |
raceme |
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nominative |
inflorescence |
An elongate, unbranched main axis bearing pedicellate flowers inserted singly along it. |
ridged |
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solid shape |
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Having one or more ridges; esp. fruits of Apiaceae (Umbelliferae). |
calyptriform |
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solid shape |
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Hollow, roughly circular in cross-section, broader and open distally, and tapering to a closed apex, like a candle snuffer or elongate hood. |
scorpioid cyme |
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nominative |
inflorescence |
A cyme in which each axial segment branches to only one side, the successive segments branching alternately to either side, the whole appearing to have a continuous, elongate, straight to zig-zag main axis. See also cincinnus, helicoid cyme (bostryx). |
inferior 1 |
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insertion |
indusium |
Inserted at the base of the sorus. |