pseudostem |
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STRUCTURE |
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A structure that resembles a stem but is not part of the axial system of a shoot, lacking anatomical differentiation into nodes and internodes. |
spine |
= thorn |
STRUCTURE |
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Any sharp, stiff, simple or branched, woody appendage having vascular tissues confluent with those of the bearing structure. "Spine" is often preferred when the appendage is homologous with a leaf or stipule, and "thorn" when it is homologous with a branch. See also prickle. |
disk |
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STRUCTURE |
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See disc. |
beak 2 |
= rostrum |
STRUCTURE |
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The inner, horn-like segment of a coronal lobe; esp. in Asclepiadaceae. |
pericarp |
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STRUCTURE |
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The portion of a fruit wall that is derived from the ovary wall; consisting of three more or less distinct tissue layers (exocarp or epicarp, mesocarp, and endocarp) that may or may not differ greatly in structure and/or function; the wall of a fruit, excluding any tissues of extra-ovarian (accessory) origin. |
turion |
< sucker |
STRUCTURE |
|
A scaly sucker. |
raphe |
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STRUCTURE |
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That portion of the funicle adnate to the integument of an anatropous ovule; represented by a longitudinal ridge or other discontinuity in the surface and/or color of the testa on one side of the mature seed. |
seta 1 pl. setae |
= arista, awn, bristle |
STRUCTURE |
|
A slender, more or less straight and stiff, fine-pointed, terminal or subterminal appendage or prolongation, sometimes a continuation of the bearing structure's central primary vein, as on a glume, lemma, or palea in Poaceae (Gramineae). |
ala 1 pl. alae |
= wing |
STRUCTURE |
|
Any elongate, relatively thin protrusion or appendage. |
lobe |
? division, segment |
STRUCTURE |
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Any generally convex, major peripheral protrusion or component sector that is delimited by concavities in the surface or margin and that is not proximally distinct from the remainder of the whole. |
axis pl. axes |
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STRUCTURE |
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Any unitary and longitudinally continuous structure that bears laterally the subordinate portion(s), if any, of a plant root or shoot or any subdivision thereof and that represents the main line of structural development and/or symmetry distal to its origin, irrespective of the particular ontogenetic growth pattern involved. See also primary axis. |
pale 2 |
= palea, palet |
STRUCTURE |
|
The upper or distal of the (usually) two distinctive bracts immediately subtending the flower in a grass (Poaceae) spikelet. |
scale 1 |
< bract |
STRUCTURE |
|
A basically dry, more or less appressed, diminutive bract. The choice of term as between the more general bract and the more restricted scale is sometimes problematic and, when so, often is dictated by custom according to the structure and taxon involved. |
dropper |
= tuberoid |
STRUCTURE |
|
An axial outgrowth that descends from a bulb and eventually forms a new bulb; esp. in Orchidaceae. |
pollinium pl. pollinia |
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STRUCTURE |
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A mass of coherent pollen grains disseminated as a unit by adhering to a pollinating insect, representing the entire content of a single theca or of fused thecae; often distally attenuate to a sterile caudicle (translator arm), which may attach to a viscidium, either directly or through an intervening stipe; esp. in Asclepiadaceae, Orchidaceae. |
enation |
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STRUCTURE |
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A relatively small outgrowth from an otherwise regular boundary or surface of a larger structure. |
funiculus pl. funiculi |
= funicle; < stalk |
STRUCTURE |
|
A stalk that attaches an ovule to a placenta of the ovary wall. |
male cone |
= microstrobilus |
STRUCTURE |
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A cone (strobilus) whose fertile organs are all microsporophylls. |
raphides sing. raphis |
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STRUCTURE |
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Needle-like crystals of calcium oxalate contained within the cells of some plants; esp. in Araceae. |
seta 2 pl. setae |
= bristle; > glochid, glochidium |
STRUCTURE |
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A trichome that is elongate, slender, more or less straight, terete, fine-pointed, and stiff. |
ala 2 pl. alae |
= wing |
STRUCTURE |
|
One of the two lateral petals in a papilionaceous corolla. |
branchlet |
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STRUCTURE |
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A branch of the highest or ultimate order. |
mesocarp |
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STRUCTURE |
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The middle tissue layer of the pericarp of a fruit. |
squamella 1 pl. squamellae |
= squamule; < scale, trichome |
STRUCTURE |
|
A diminutive squama (lepis). |
palea 1 pl. paleae, paleas |
= pale, palet, receptacular bract |
STRUCTURE |
|
A small papery (chartaceous) to membranous bract borne on the compound receptacle (torus) of a capitulum (head) in Asteraceae (Compositae). |