PORTULACACEAE 533 



Poppy, Papaver; Calif ornian -, Eschsc/iollzia, Platystemon; opium-, 

 Papaver somniferum L. ; Welsh -, Meconopsis cambrica Vig. ; yellow 

 horned-, Glancium flavum Crantz. 



Populina Baill. Acanthaceae (iv. B). i Madag. 



Populus L. Salicaceae. 20 N. temp. P. alba L. (white poplar) and 

 P. tremula L. (aspen) in Brit. Like Salix, but fls. wind-polli- 

 nated, with no honey; usu. more sta. than Salix. The wood of 

 P. alba is useful, and also that of P. nigra L. (black poplar) with its 

 variety pyramidalis^^n. (P. fastigiata Desf.), the Lombardy poplar, 

 often cult., P. canadensis Michx. (cotton-wood tree, N. Am.) and 

 others. P. bahamifera L. (balsam poplar) yields a resin (tacamahac, 

 see Calophyllum). 



Porana Burm. f. Convolvulaceae (i). 10 Indomal. 



Poranthera Rudge, Euphorbiaceae (B. i). 5 Austr. 



Poraqueiba Aubl. Icacinaceae. 3 N. Brazil, W.I. 



Porcelia Ruiz et Pav. (Uvaria p.p. EP.). Anonaceae (j). 4 trap. Am. 



Porcupine grass (Am.), S/i/>a; -wood, Cocos nucifera L. 



Pores, dehiscence by, cf. Stamen. 



Porlieria Ruiz et Pav. Zygophyllaceae. 3 Mexico, Andes. The 

 leaflets of P. hygrometrica R. et P. spread out horiz. at night, but in 

 the day fold up in pairs, reducing transpiration. Good timber. 



Porochna Van Tiegh. (Ochna p.p.)- Ochnaceae. 12 trop. Afr. 



Porocystis Radlk. Sapindaceae (i). i Amazon valley, Guiana. 



Porogamae, see Chalazogamae ; porogamic (feit.), by micropyle. 



Porophyllum Vaill. ex L. Compositae (6). 28 warm Am. 



Porospermum F. Muell. Araliaceae (2). i N.E. Austr. 



Porotheca K. Schum. Menispermaceae. i New Guinea. 



Porpax Lindl. (Eria p.p. BH.}. Orchidaceae (n. 15). 6 Indomal. 



Porphyranthus Engl. Burseraceae. i Cameroons. 



Porphyrocodon Hook. f. Cruciferae (4). i Colombia. 



Porphyrocoma Scheidw. (Dianthera p.p. BH.}. Acanthaceae (iv. B). 

 2 trop. S. Am. Cult. orn. fl. 



Porphyrodesme Schlechter (Saccolabituit p.p.). Orchidaceae (u. 20). 

 i New Guinea. 



Porphyroglottis Ridl. Orchidaceae (n. a. n). i Borneo. 



Porphyrospatha Engl. Araceae (vi). 3 C. Am. 



Porphyrostemma Benth. ex Oliv. Compositae (4). i E. Centr. Afr. 



Porrum (Tourn.) L. = Allium Tourn. p.p. (Lili.). 



Portea C. Koch. Bromeliaceae (4). 5 Brazil. Cult. orn. infl. 



Portenschlagia Vis. Umbelliferae (in. 5). i Dalmatia. 



Porteria Hook.= Phyllactis Pers. (#Zf.)=Valeriana Tourn. p.p. 



Portesia Cav. = Trichilia P. Br. (Meli.). 



Portland arrowroot. Arum ma.cn/atum L. 



Portlandia P. Br. Rubiaceae (i. i). 8 W.I. , Mexico. 



Portugal laurel, Primus lusitanica L. 



Portulaca L. Portulacaceae. 20 trop. and subtrop. (purslane). Thefl. 

 has a semi-inf. ovary and 4 costa. It remains closed in bad weather. 

 The sta. of P. oleracea L. are sensitive to contact and move toward 

 the side touched. 



Portulacaceae (EP., BH.}. Dicots. (Archichl. Centrospermae ; Caryo- 

 phyllinae BH.}. 17 gen., 225 sp., cosmop., but esp. Am. Most are 



