OSMUND A CEAE 475 



Orthosia Decne. ( Vincetoxicum Moench Bff., Cynanclmm L. p.p. EP.). 

 Asclepiadaceae (II. i). 12 S. Am. 



Orthosiphon Benth. Labiatae (vn). 50 Indomal., trop. Afr. 



Orthostemon Berg. (Feijoa p.p. BH.]. Myrtaceae (i). i subtrop. 

 S. Am. 



Orthostemon R. Br. (Canscora p.p.). Gentianaceae (i). i trop. Afr. 



Orthotactus Nees=Dianthera Gronov. (BH.) = Justicia L. 



Orthrosanthus Sweet. Iridaceae (n). 7 Austr., S. Am. to Mexico. 



Orumbella Coulter et Rose (Ligusticum p.p.). Umbelliferae (ill. 5). 

 i Alaska. 



Orychopliragmus Bunge (Moricandia p.p. BH.}. Crucif. (4). [ N. 

 China. 



Oryctanthus Eichl. (LoraiitAusp.p.gff.). Loranth.(i). 10 trop. Am. 



Oryctes S. Wats. Solanaceae (2). i Nevada. 



Orygia Forsk. Aizoacae (i). i Afr. to Mysore. 



Oryza L. Gramineae (6). 6 trop., incl. 0. sativa L. (rice), one of the 

 chief food plants of the world, an annual, wild in Indomal., S. Am. 

 The cult, rices are probably derived polyphyletically from some of 

 these. The main kinds are hill and swamp rice, the former chiefly 

 grown by wild tribes. Swamp rice is chiefly cult, in Bengal, S. India, 

 S.E. As., Japan, China and S. Am., and occurs in oo vars. It is cult. 

 in shallow water till nearly ripe, when the water is drained off. The 

 grain in the husk is known as paddy. 



Oryzopsis Michx. Gramineae (8). 15 N. temp. 



Osage orange, !\Iaclura atirantiaca JSfutt. 



Osbeckia L. Melastomaceae (i). 50 palaeotrop. 



Osbornia F. Muell. Myrtaceae (n. i). i N.E. Austr. 



Oschatzia Walp. (Azorella p.p. BH.). Umbelliferae (i. i). 2 Austr. 



Oserya Tul. et Wedd. Podostemaceae. 5 Brazil to Mexico. 



Osier, Salix vitninalis L. 



Osmanthus Lour. Oleaceae. 10 E. and S. As., Polynes., N. Am. 

 O. fragrans Lour. (Oleafragrans Thunb.), often cult. , has ed. fr., and 

 its 1. are used to perfume tea. 



Osmelia Thw. Flacourtiaceae (7). 3 Indomal. 



Osmia Sch.-Bip. (Eupatorinin p.p.). Compositae (2). 3 N. Am. 



Osmites L. Compositae (4). 6 Cape Colony. 



Osmitopsis Cass. Compositae (4). i Cape Colony. 



Osmohydropliora Barb. Rodr. Bignoniaceae (i). i Amazonas. 



OsmorMza Rafin. Umbelliferae (in. 2). 15 As., Am. 



Osmoxylon Miq. Araliaceae (i). 2 Malay Archipelago. 



Osmunda L. Osmundaceae. 10 temp, and trop. O. regalis L. (royal 

 fern) in Brit, has a root-stock sometimes a foot high, like the stem 

 of a tree fern, bearing scale 1. below the soil and ordinary 1. above. 

 The fronds are large ( i 10 feet) ; the lower pinnae are veg., the upper 

 are repr. only and form a sort of panicle. They are densely covered 

 with sori, which have no indusium and have a peculiar annulus con- 

 sisting of a round group of cells at one side of the apex. The 

 sporangium dehisces longitudinally. Other sp. have the fertile pinnae 

 on the lower part of the 1., others again have separate veg. and repr. 1. 



Osmuudaceae. Filicales Leptosporangiatae. 2 gen., 12 sp. , trop. and 

 temp. Short-stemmed ferns, with naked sori. The sporangia are 



