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Leaf blades are broadly ovate or very broadly ovate, widest below the middle, with a rounded or subacute apex, usually cuneate base, and irregularly notched edges. The upper surfaces of the leaves are hairy with short to long, sparsely to densely distributed non-glandular hairs, the lower surfaces are glabrous, and both surfaces are punctate .
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]
Leaf petioles are 4.5–33.7 mm long. Leaf blades are 4.0–14.9 mm long by 4.6–12.3 mm wide (length: width ratio 0.8–1.1: 1), very broadly ovate or circular, widest at or below the middle, with a rounded apex, truncate or slightly cordate base and smooth or irregularly notched edges.
Ourisia calycina can be distinguished from another large-leaved species, O. macrophylla, by its notched or irregularly toothed calyx lobes (vs. calyx lobes with smooth edges), and a lack of glandular hairs anywhere on the mostly hairless plants (vs. glandular hairs present at least on the pedicel and generally hairy plants). [5]
Ourisia glandulosa is morphologically most similar to another New Zealand small-leaved species, O. caespitosa, as both species are prostrate plants with tightly packed, often irregularly notched leaves and with flowers single or in pairs at each node (not whorled).
Ourisia caespitosa can be distinguished from all other New Zealand species of Ourisia by its mostly glabrous aspect, trilobed or irregularly notched leaves that are tightly packed along the creeping stem. [5] [7] Ourisia caespitosa is morphologically most similar to another New Zealand species, O. glandulosa.
3. A type of vernation of two leaves at a node, in which one half of each leaf is exposed and the other half is wrapped inside the other leaf. corcle A plant embryo, plumule, or plumule plus radicle. cordate Heart-shaped, with the notch lowermost; of the base of a leaf, like the notched part of a heart.
The marginal lobes, which are the leaf-like structures around the edge of the thallus, can be up to 5 mm broad and are often raised at the margins and wavy with irregularly incised (cut or notched) edges. [14]