5i8 PIT YO PUS 



Pity opus J. K. Small (Monotropa p.p.). Pyrolaceae. i Oregon. 



Pityranthe Thvv. Tiliaceae. i Ceylon. 



Pityrodia R. Br. Verbenaceae (3). 15 Austr. 



Piuttia Mattel (Thalictrum p.p.). Ranunculaceae (3). I Himalaya. 



Placea Miers. Amaryllidaceae (i). 3 Chili. 



Placenta, see Ovary ; Biitomaceac, Cabomba. 



Placocarpa Hook. f. Rubiaceae (n. 3). i Mexico. 



Placodiscus Radlk. Sapindaceae (i). 3 trop. Afr. 



Placolobium Miq. Leguminosae (inc. sed.). i Sumatra. 



Placopoda Balf. f. Rubiaceae (i. 2). i Socotra. 



Placus Lour. = Blumea DC. (Comp.) 



Pladera Soland. =Canscora Lam. (Gentian.) 



Plaesiantha Hook. f. (Pellacalyx EP.). Rhizophoraceae. i Borneo. 



Plagianthus Forst. Malvaceae (2). 10 Austr., N.Z. P. betulinus A. 

 Cunn. (N.Z. ; lace-bark) good timber. 



Plaglo- (Gr. pref.), oblique; -tropic, placing itself JL the stimulus. 



Plagiobasis Schrenk. Compositae (i i). 2 W. As. 



Plagiobothrys Fisch. et Mey. Boraginaceae (iv. 2). 15 Pac. Am. 



Plagiocarpus Benth. Leguminosae (m. 6). i trop. Austr. 



Plaglocaryum Willd. Inc. sed. i Brazil. 



Plaglocheilus Arn. Compositae (7). 7 S. Am. 



Plagiogyria Kunze. Polypodiaceae. n E. As., Am. 



Plagiolirion Baker (Elisena EP.). Amaryllidaceae (l). i Colombia. 



Plagiolophus Greenman. Compositae (5). i Yucatan. 



Plagiopteron Griff. Flacourtiaceae (inc. sed.). i Further India. 



Plagioscyphus Radlk. Sapindaceae (i). i Madagascar. 



Plagiosetum Benih. Gramineae (5). i Austr. 



Plagiosiphon Harms. Leguminosae (n. 2). i trop. Afr. 



Plagiospermum Oliv. Rosaceae (n?) (Celastr. BH.}. i N. China. 



Plagiostachys Ridl. (Alpinia p.p.). Zingiberaceae (i). 5 Malaya. 



Plagiostyles Pierre. Euphorbiaceae (A. i. i). i trop. Afr. 



Plagius L' Merit. = Chrysanthemum Tourn. p.p. (Comp.) 



Planaltoa Taubert. Compositae (2). i C. Brazil. 



Planchonella Van Tiegh. Ochnaceae. i Peru. 



Planchonia Blume. Lecythidaceae. 3 Malay Archipelago. 



Plane tree, Platanns orientalis L.; (Scotland) sycamore. 



Planera J. F. Gmel. Ulmaceae i S. U.S., a useful timber tree. 



Planodes Greene (Cardamine p.p.). Cruciferae (2). i temp., subtrop. 



Planotia Munro. Gramineae (13). 5 trop. S. Am. 



Plant formations, associations, societies, descending grades of commu- 

 nities of plants found associated together on land with similar ecological 

 characters. The sand-dune formation, e.g., is split (in England) into 

 associations of strand-plants, of marram grass, and _ft.\~ed dunes, and 

 these again into societies. Cf. Tansley, Types of British Vegetation, 

 Cambridge, 1911; -s and insects, cf. Flowers; insectivorous-, cf. 

 Insectivorous ; ornamental-, cf. Ornamental. 



Plantaginaceae (EP., BH.). Dicots. (Sympet. Plantaginales). 3 gen., 

 200 sp. cosmop. (See genera.) Annual or perennial herbs; 1. 

 without distinction into stalk and blade, exstip. Fls. usu. in heads 

 or spikes, inconspic., usu. g , reg. , without bracteoles, wind- or partly 

 insect-fert. K (4), diagonally placed ; C usu. (4) membranous; A 4, 



