OOB- prefix indicates inversion.
OBTUSE with a blunt or rounded tip.
ORBICULAR flat with a circular outline, disc-like.
OVARY the part of the pistil which contains the ovules (immature fruit).
OVATE egg-shaped, usually with reference to two dimensions.
OVOID egg-shaped, usually with reference to three dimensions.
OVULE the young seed in the ovary.
PPALMATE flat and lobed.
PANICLE a compound inflorescence in which the main axis bears lateral racemes or spikes.
PAPILLA a small soft superficial gland or protuberance.
PAPILLATE having papillae.
PAPILLOSE covered with papillae.
PARENCHYMA undifferentiated plant tissue composed of more or less uniform cells.
PARIETAL used of the attachment of ovules to the outer walls of the ovaries.
PEDICEL the stalk of the flower.
PEDUNCLE the axis from which the flower pedicel arises.
PELLUCID Admitting the passage of light; transparent or translucent
PELTATE with the petiole attached to the lower surface of the leaf blade.
PENDENT hanging down.
PERENNIAL a plant that continues its life cycle for more than two years.
PERIANTH the two outer whorls of the Angiosperm flower; commonly used when the calyx and the corolla are not readily distinguishable (as in monocotyledons).
PERSISTENT remaining attached to the plant, opposed to deciduous.
PETIOLE the stalks of the leaf.
PHYLLOPODIA persistent leaf bases present in some members of the crassulacae.
PINNATIFID a pinnately parted leaf, dividing almost to the midrib.
PLACENTA the organ which bears the ovules in the ovary.
PLACENTATION refers to the arrangement of the placentae and ovules in the ovary.
POLLINIA the paired, waxy pollen masses of the stapeliae.
PROCUMBENT trailing on the ground without rooting.
PROSTATE flat on the ground.
PRUINOSE having a waxy, powdery 'bloom'.
PUBERULOUS covered with a minute down.
PUBESCENT covered with short soft hairs.
RRACEME an inflorescence with a single axis bearing pedicellate flowers.
REFLEXED abruptly bent backwards.
REPAND with slightly undulate margin.
REPLICATE folded back, as in the corolla lobes of duvalia.
RETICULATE having the appearance of a network.
RETUSED with blunted apex, as in the leaves of some haworthias.
REVOLUTE rolled back at the margin.
RHIZOME a prostrate or underground stem which generally grows horizontally.
ROSETTE used to describe a cluster of densely spiralled leaves.
ROSULATE having a rosette.
RUGOSE covered with wrinkles.