PE TA SITES 
508 
the usual mechanism of Compositae, the style acting as the pollen- 
presenter, though the ovary is no longer fertile. Occasionally a few 
5 firs, are found. The female head consists of about 150? firs, sur- 
rounding 1 — 3 c?flrs. Only the male firs, secrete honey. Under the 
name of winter heliotrope, P. fragrans Presl is cultivated for its 
scented firs., which appear in February. 
Petrea Houst. ex Linn. Verbenaceae (11). 12 sp. trop. Am., W. Ind. 
Petrophila R. Br. Proteaceae (1). 35 sp. Austr. 
Petrophyes Webb et Berth. = Monanthes Haw. 
Petroselinum Hoffm. = Carum Linn. 
Petunia Juss. Solanaceae (iv). 14 sp. S. Am. P. violacea Lindl. 
and others are often cultivated in gardens. 
Peucedanum (Tourn.) Linn. (incl. Anethum Tourn., Imperatoria Linn. 
Pastinaca Linn.). Umbelliferae (7). 120 sp. Eur., As., Afr., Am.; 
4 in Brit., of which P. (Past,) sativum Benth. et Hook. f. is the 
parsnip, often cultivated for its fleshy roots. P. (A) graveolens 
Benth. et Hook. f. (Medit.) is the dill, whose fruits are used as a 
condiment; P. officinale L. (Brit.) is the sulphur-root, used in veteri- 
nary practice; P. (/.) Ostruthium Koch (Brit.) is also used. 
Peumus Molina. Monimiaceae. 1 sp. Chili, P \ Boldus Molina, the 
Boldo. The wood is hard, the bark yields a dye and the fruit is 
edible. 
Phaca Linn. = Astragalus Linn. 
Phacelia Juss. (incl. Cos?na?ithus Nolte, Eutoca R.Br., Whitlavia 
Harv.). Hydrophyllaceae. 80 sp. N. Am., Andes. Often cultivated 
as border plants and for bee-feeding. The flr. is a bee-flower with 
honey secreted below the ovary and guarded by stipule-like flaps at 
the base of the sta. The large-flowered sp. are highly protandrous, 
and are not self-fertilised; the smaller less protandrous and with 
self-fertilisation. The anther as it dehisces turns inside out, and 
changes its shape from ellipsoidal to spherical (Linn. Soc. Journ 
1893, P- 53 )- 
Phaedranassa Herb. Amaryllidaceae (1). 4 sp. S. Am. 
Phaenocoma D. Don. Compositae (iv). 1 sp. Cape Colony. 
Phajus Hassk. Orchidaceae (15). 12 sp. trop. As., Malaya, Austr., &c. 
Terrestrial plants. 
Phalaenopsis Blume. Orchidaceae (31). 35 sp. Indo-mal. Epi- 
phytes with flattened aerial roots. 
Phalaris Linn. Gramineae (vn). 10 sp. Eur., Am. P. canariensis L. 
is the canary grass, whose seeds are used for cage-birds. P. arundi- 
nacea L. (reed -grass) is common in Brit. 
Pharbitis Choisy = Ipomoea Linn. 
Pharus P. Br. Gramineae (vi). 5 sp. trop. Am. 
Phaseolus (Tourn.) Linn. Leguminosae (ill. 10). 150 sp. trop. and 
warm temp. The floral mechanism is like that of Vicia, but compli- 
cated by the spiral coiling of the keel with the inclosed style. P. 
