PETROSELINUM 501 



Petalodiscus Baill. (Savia BH.}. Euphorbiaceae (A. I. i). 5 Madag. 



Petalolophus K. Schum. Anonaceae (4). i New Guinea. 



Petalonema Gilg. Melastomaceae (i). i trop. E. Afr. 



Petalonyx A. Gray. Loasaceae. 4 Mexico, S.W. U.S. 



Petalostelma Fourn. Asclepiadaceae (n. 3). i Brazil. 



Petalostemma R. Br. Inc. sed. i Abyssinia. 



Petalostemon Michx. (Kuhnistera EP.}. Legumin. (in. 6). 25 N. Am. 



Petalostigma F. Muell. Euphorbiaceae (A. I. i). i E. Austr. 



Petalostylis R. Br. Leguminosae (n. 5). i Austr. 



Petasites (Tourn.) L. Compositae (8). 15 N. temp. P. .offidnalis 

 Moench (butter-bur) in Brit, spreads largely by rhiz. It is dioecious 

 (cf. Tussilago, its close ally). The 3 head has about 30 fls. with the 

 usual mech. of Compositae, the style acting as pollen-presenter, 

 though the ovary is not fertile. Occasionally a few $ fls. are found. 

 The 9 head consists of about 150 $ fls. surrounding i 3 c? fls. Only 

 the male fls. secrete honey. P. fragrans Presl (winter heliotrope) 

 cult. perf. fls., which appear in Feb. 



Petastoma Miers (Bignonia p.p. BH.}. Bignoniaceae (i). 8 trop. Am. 



Peteria A. Gray. Leguminosae (ill. 6). i New Mexico. 



Petermannia Y. Muell. Dioscoreaceae. i New S. Wales. 



Petersia Welw. Lecythidaceae. 2 W. trop. Afr. 



Petersianthus Merrill (Petersia Welw.). Lecythid. 3 Afr., Phil. I. 



Petesia P. Br. = Rondeletia L. (Rubi.). 



Petesioides Jacq. (Wallenia Sw. ). Myrsinaceae (11). 4 W.I. 



Petiole, leafstalk ; sensitive -, cf. Climbing Plants. 



Petitia Jacq. Verbenaceae (4). 4 Mexico, W.I. 



Petitmenginia Bonati. Scrophulariaceae (in. 2). i Cambogia. 



Petiveria Plum, ex L. Phytolaccaceae. i warm Am., W.I. 



Petlomelia Nieuwland (Fraxinus p.p.). Oleaceae. i N. Am. 



Petraeus (Lat.), growing on rocks; petrium (Cl.), a rock formation; 

 -odium (Cl. ), a boulder field formation. 



Petraeovitex Oliv. Verbenaceae (5). 3 Malay Archipelago. 



Petrea Houst. ex L. Verbenaceae (i). 12 trop. Am., W. Ind. Cult, 

 orn. fl., climber. 



Petrobium R. Br. Compositae (5). i St Helena. 



Petrocallis R. Br. (Draba p.p. BH.). Cruciferae (2). i Mts. S. Eur. 



Petrocarya Schreb. = Parinarium Aubl. (Ros.). 



Petrocodon Hance. Gesneriaceae (i). i Chili. 



Petrocoptis A. Br. (Lychnis p.p. BH.}. Caryophyll. (n. i). 2 

 Pyrenees. 



Petrocosmea Oliv. Gesneriaceae (i). 3 China. 



Petrollinia Chiov. (Iniila p.p.). Compositae (4). i E. trop. Afr. 



Petromecon Green (Eschscholtzia p.p.). Papaver. (n). 2 Calif. 



Petronia Barb. Rodr. (Promenaea p.p. EP.}. Orchid, (n. /3. n). 

 i Braz. 



Petrophila R. Br. Proteaceae (i). 35 Austr. 



Petrophyes Webb et Berth. = Monanthes Haw. (Crassul.). 



Petrophyton Rydberg (Spiraea p.p.). Rosaceae (i. i). 5 N. Am. 



Petrosavia Becc. Liliaceae (i). i Borneo. 



Petroselinum Hoffm. (Canim p.p. BH.}. Umbelliferae (in. 5). 5 

 Eur., Medit. P. sativum Hoffm. is the parsley, cult, as condiment. 



