Abstract
Small to medium-sized trees or shrubs; vegetative parts and inflorescence axes puberulent with unicellular, straight to curved, uncinate or non-uncinate hairs and also clavate hairs with a short, several-celled stalk and a globular (glandular?), usually several-celled head; new shoots usually conspicuously lenticellate, distinct resting buds not formed but a few cataphylls sometimes present at base of a flush in at least P. baylisiana and P. corymbosa. Leaves alternate in 2/5 spiral phyllotaxy, ptyxis curved to almost conduplicate; blades chartaceous to subcoriaceous, brown to dark brown when dry; margins of adult leaves mostly entire or obscurely sinuous but sometimes crenately toothed (at least in seedlings, on reversion shoots, and in P. corymbosa adult foliage); domatia (pocket or pit types) variously present, fringed by non-uncinate hairs (domatia obscure and glabrous in P. endlicheri); lateral nerves 4–6 pairs, diverging at ca. 45° from midrib, further venation only slightly prominent above or not at all (P. corymbosa). Inflorescences terminal on leafy shoots (but mostly ramiflorous to cauliflorous in P. baylisiana), paniculate; branches spirally arranged or ± disjunct-opposite; bracts bracteose, narrow, up to ca. 4 mm long; pedicels articulate to calyx base. Flowers probably functionally unisexual, plants ± dioecious; calyx a collar with 5 minute triangular lobes (P. cunninghamii) or some or all lobes lacking; petals 5, free, valvate, white to greenish, adaxially with a fleshy-papillate apical projection and a low central longitudinal ridge; stamens 5, epipetalous, filaments free, glabrous; in mature bud filaments inflexed in their distal part or bent out laterally; anthers versatile, dehiscence latero-introrse; ovary 1-locular, apparently 3-carpellate; ovule solitary, pendulous, anatropous; stigmas 3, each on a short apical style (P. cunninghamii) or sessile and latero-apical in a ring at the truncate ovary top, free (P. corymbosa, P. endlicheri) or not (P. baylisiana). Fruit a drupe, dark purple; stone ± smooth, either bony and somewhat trigonous in cross-section, or (P. cunninghamii) chartaceous and ± terete. Embryo non-chlorophyllous, minute, endosperm copious, oily.
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Potgieter, M.J. (2018). Pennantiaceae. In: Kadereit, J., Bittrich, V. (eds) Flowering Plants. Eudicots. The Families and Genera of Vascular Plants, vol 15. Springer, Cham. https://doi.org/10.1007/978-3-319-93605-5_10
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