PODOCARPUS 
5i9 
bark. This sp. is comparatively small, but grows in great colonies, 
owing to adventitious budding from the roots. In both sp. the bases 
of the leaves are rather fleshy and act as water stores. 
The stag-horn ferns are favourites in hot-houses. Beside the two 
mentioned, P. Wallichii Hook, and P. Willinckii Moore are also 
grown. They have the habit of P. grande. 
Platycodon A. DC. Campanulaceae (1. 1). 1 sp. E. As. 
Platylobium Sm. Leguminosae (ill. 3). 3 sp. Austr. Pods flat. 
Platystemon Benth. Papaveraceae (11). 1 sp. W. N. Am., P. cali- 
fornicus Benth. Leaves in apparent whorls (see order). 
Platystigma Benth. Papaveraceae (11). 3 sp. California, Oregon. 
Leaves as in Platystemon. 
Plectocomia Mart, et Blume. Palmae (ill. 5). 6 sp. Indo-mal. 
Climbers like Calamus with hooked leaves. 
Plectranthus L’Herit. Labiatae (vn). 70 sp. trop. Old World. 
Plectritis DC. = Valerianella Tourn. 
Plectronia Linn. Rubiaceae (11. 11). 80 sp. trop. Old World. Some 
have axillary thorns. 
Pleione D. Don = Coelogyne Lindl. 
Pleroma D. Don = Tibouchina Aubl. 
Pleurothallis R. Br. Orchidaceae (12). 400 sp. trop. Am. 
Pluchea Cass. Compositae (iv). 30 sp. trop. and subtrop. 
Plumbaginaceae. Dicotyledons (Sympet. Primulales). 10 gen. with 
280 sp. cosmop., but esp. on salt steppes and sea-coast. 2 Brit, genera. 
Perennial herbs or shrubs with narrow leaves, on whose surface water 
glands occur, or sometimes chalk glands (cf. Saxifraga). The infl. is 
of various types, racemose and cymose (see Plumbago, Ceratostigma, 
Statice, Armeria), bracteolate. Firs, regular, £ , 5-merous, the odd 
sepal posterior. Calyx persistent. Corolla often nearly polypeta- 
lous, convolute. Sta. 5, epipetalous and opposite the petals. Ovary 
superior, i-loc., with basal placenta. One anatropous ovule, whose 
stalk projects up to the top of the loc. and thus causes the micropyle 
to be directed upwards. Styles or stigmas 5. Fruit a nut ; embryo 
straight, in floury endosperm. The order is distinguished from Pri- 
mulaceae by the ovary and styles. Chief genera : Plumbago, Cerato- 
stigma, Acantholimon, Armeria, Statice, Limoniastrum. Placed in 
Primulales by Benth.-Hooker, in Primulinae by Warming. 
Plumbago Tourn. ex Linn. Plumbaginaceae. 10 sp. Medit. and trop. 
Racemose infl. Calyx with glandular hairs, aiding seed -dispersal. 
Plumeria Tourn. ex Linn. Apocynaceae (1. 3). 40 sp. trop. Am. 
Several are cultivated for the beauty and sweetness of the firs. 
Poa Linn. Gramineae (x). 100 sp. temp. ; 8 in Brit, (meadow grass). 
Many are useful pasture-grasses. 
Pocockia Ser. = Trigonella Linn. 
Podalyria Lam. Leguminosae (in. 2). 20 sp. S. Afr. 
Podocarpus (L’Herit.) Pers. Coniferae (Taxac. 3; see C. for genus 
