478 OVARY 



horizontal, or pendulous. It maybe ortho- or atropous (in a line with 

 stalk, micropyle away from the latter), anatropous (reversed, and 

 attached to stalk along side), amphitropous (stalk attached to middle 

 of ovule), or campylotropous (ovule itself curved into U shape). 



Ovate (1.), about twice as long as broad, tapering to the tip. 



Overlook (W.I.), Canavalia ensiformis DC. 



Ovidia Meissn. Thymelaeaceae. 4 Chili. 



Ovieda L. = Clerodendron L. (Verben.). 



Ovoid, solid oval. 



Ovule, the possible future seed, cf. Ovary. 



Ovuliferous scale, cf. Coniferae. 



Ovum, the ? sexual cell, Angiosperm<ie t Pteridophyta. 



Owataria Matsumura. Guttiferae (v). i Formosa. 



Owenia F. Muell. Meliaceae (in). 5 Austr. 



Oxalidaceae (EP.\ Gcraniaceae p.p. BH.). Dicots. (Archichl. Gerani- 

 ales). 7 gen., 250 sp., mostly trop. and subtrop. Most are perennial 

 herbs with alt. often cpd. exstip. 1. and large fls., usu. in cymes, ?, 

 reg. K 5, imbr., persistent ; C 5, twisted or imbr. , free or slightly 

 united ; A 10, obdiplost. (i.e. the outer whorl opp. to the petals, the 

 inner to the sepals, and thus the cpls. opp. to the petals, instead of to 

 the sepals, as in cliplostemonous fls. with two whorls of sta. in proper 

 alternation), united below, with introrse anthers ; G (5), with free 

 styles, 5-loc., with axile plac. ; ovules in i or 2 rows in each loc., or 

 few, anatr. , with micropyle facing upwards and outwards. Capsule 

 or berry ; embryo straight, in fleshy endosp. Chief genera: Oxalis, 

 Biophytum, Averrhoa. Closely allied to Geraniaceae. The chief 

 difference is in the fruit. 



Oxalis L. Oxalidaceae. 300 cosmop. chiefly S. Afr. , Am. 0. Aceto- 

 sella L. (wood-sorrel) in Brit, is a small herb with monopodial rhiz. 

 and ternate 1., which sleep at night and in cold weather, the leaflets 

 bending downwards. The fl. is protandr. ; the stalk bends down- 

 wards and the fl. closes in dull or cold weather. Cleistogamic fls. 

 (cf. Viola) occur. Loculic. caps. The seed has a fleshy aril springing 

 from the base. When ripe the cells of the inner layers are extremely 

 turgid, and a small disturbance causes the aril to turn inside out, as 

 one might turn a glove-finger, from U to D. This is done instan- 

 taneously and the seed is shot off. 



Many have bulbous or tuberous stems. Some, e.g. 0. bttpleitri- 

 folia A. St Hil., have phyllodes in place of the ordinary 1. (cf. Acacia). 

 Fls. sol. or in cymose infls. Many exhibit trimorphic heterostyled fls. 

 (see Darwin, Forms of Fls. ) ; there are three stocks of pi., one bearing 

 fls. with long styles, and mid- and short- length sta., the others with 

 mid or short styles and correspondingly long and short or long and 

 mid sta. (cf. Ly thrum). Some produce axillary bulbils ; others repr. 

 veg. by underground offshoots. The tubers of O. Deppei Lodd. (S. 

 Am., Mex.), and others, are used as food. 



Oxandra A. Rich. (Bocagea p.p. BH.}. Anonaceae (i). 7 trop. Am. 

 Wood useful. 



Oxera Labill. Verbenaceae (4). 15 New Caled. 



Oxeye-daisy, Chrysanthemum Leiicantheiniim L. ; oxlip, Prinntla 

 elatior Hill. 



