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A straight, stiff hair (smooth or with minute teeth); the upper part of an awn (when the latter is bent and has a lower, stouter, and usually twisted part, called the column). brochidodromous Pinnate leaf venation in which the secondary vein s do not terminate at the leaf margin, but are joined in a succession of prominent arcs. brochus. pl. brochi
Chart illustrating leaf morphology terms. The following terms are used to describe leaf morphology in the description and taxonomy of plants. Leaves may be simple (that is, the leaf blade or 'lamina' is undivided) or compound (that is, the leaf blade is divided into two or more leaflets). [1]
paripinnate: pinnately compound leaves in which leaflets are borne in pairs along the rachis without a single terminal leaflet; also called "even-pinnate". imparipinnate: pinnately compound leaves in which there is a lone terminal leaflet rather than a terminal pair of leaflets; also called "odd-pinnate".
Dicot leaves have blades with pinnate venation (where major veins diverge from one large mid-vein and have smaller connecting networks between them). Less commonly, dicot leaf blades may have palmate venation (several large veins diverging from petiole to leaf edges). Finally, some exhibit parallel venation. [19]
Pinnate (pinnata) – two rows of leaflets. odd-pinnate – pinnate with a terminal leaflet. paripinnate, even-pinnate – pinnate lacking a terminal leaflet. Pinnatisect (pinnatifida) – cut, but not to the midrib (it would be pinnate then). Reniform (reniformis) – kidney-shaped. Rhomboid (rhomboidalis) – diamond-shaped.
Urticalean families span a wide range of morphological features—deciduous or evergreen trees, vines, shrubs, annuals and some succulents. Leaves also vary though they tend to share brochidodromous or palmately pinnate venation, often associated with lobing or compounding in the leaf blade.
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Kuijt [4] describes Psittacanthus biternatus as having: . paired leaves are broadly obovate (egg shaped) to nearly round, with obtuse bases and apices rounded, with petioles 8–10 mm long, with often obscure palmate to pinnate venation;