AN ENCYCLOPAEDIA 
OF HORTICULTURE. 479 
nothera— continued. i 
taraxacifolia (Dandelion-leaved).* fl. white, becoming red- 
dish as they fade, with large, obovate, entire petals, and a very 
long tube. Summer. . pubescent, alternate, interruptedly pin- 
natifid, sinuately too ay but the apex entire. Stem branched, 
elongated, procumbent. A. 6in. Chili, 1825. (S. B. F. G. 294.) 
. tenella (delicate). fl. purple. June, J. linear-spathulate. 
Stem branched, erect. R. 6in. to 9in. Chili, 1825. Plant rather 
glaucous. Annual. (B. M. 2424.) G. tenuifolia is very closely 
allied to this species. 
E. triloba (three-lobed). fl. pale yellow, very fragrant in 
the evening; petals obovate, slightly three-lobed at the apex, 
the middle lobe mucronate. May to September. l. interruptedly 
pinnatifid, toothed. A. Sin. to bin. North America, 1822. Annual. 
(B. M. 2566.) 
Œ. vinosa (wine-stained). fl., petals nearly white, with a slight 
dash of purple ; calyx tube not more than one-third the length 
of the limb. July and August. J. linear-oblong, sub-dentate, 
glabrous. k. 2ft. California, 1855. Hardy annual. (B. R. 1880, 
under name of Godetia vinosa.) 
œŒ. Whitneyi (Whitney’s).* fl. very numerous, crowded, 3in. to 
4in. in diameter, rosy-red, blotched with crimson. Summer. 
J. oblong-lanceolate. k. lft. to lift. California, 1870. Annual. 
SYN. Godetia grandiflora (B. R. 28, 61). (B. M. 5867.) There are 
several varieties of this fine species, including concolor (white), 
nammea (crimson), and jlammea striata (crimson-striped). 
Varieties. Of hardy annuals, few are more beautiful than 
than some of the garden varieties of @nothera, which are 
much better known under the familiar name of Godetia. 
They are very attractive in mixed borders, especially if 
sown in masses, and are also most effective when grown 
in pots for greenhouse decoration. The following are 
amongst the best in cultivation : 
Duchess of Albany. „. of a beautiful satiny-white, sometimes 
4in. across. Plant of pyramidal growth, very floriferous, and 
extra good, 
Fic. 725. FLOWERING BRANCHES OF CENOTHERA LADY 
ALBEMARLE, 
Albemarle, f. crimson, showy, and distinct. Plant dwarf 
and branching ; very beautiful. See Fig. 725. 
Lady Satin Rose. fl. beautiful rose. Habit similar to LADY 
ALBEMARLE. A brilliant-coloured and good variety. 
l of Wales. ji. ruby-crimson. A good, rather old, 
variety, rather taller growing than either of the preceding. 
The Bride, fl. white and carmine. Very free tlowering and pretty. 
ŒNOTHERÆ. A synonym of Onagrarie. 
OFFICINAL. Sold in shops. 
OFFSETS. An Offset is a short, lateral shoot, bear- 
ing clustered leaves at the extremity, and capable of 
taking root when separated from the parent plant. The 
order Crassulace® affords several examples. 
OFTIA (meaning unexplained by its author). Syn. 
Spielmannia. ORD. Myoporinee. A genus comprising 
only a couple of species of greenhouse, evergreen shrubs, 
natives of South Africa. Flowers white, in the upper 
axils, sessile, or shortly pedicellate, ebracteate; calyx 
five-parted ; corolla tube cylindrical; limb of five obovate, 
spreading lobes. Leaves alternate, or the lower ones 
opposite or almost whorled, sessile, serrulate, often 
rather small. The undermentioned species will thrive 
in any rich light soil. Young plants may be readily 
obtained by means of cuttings, inserted in sand, under 
a glass, in heat. 
O. africana (African). jl. white, solitary, axillary; corolla 
salver-shaped, the segments marked with a blue streak at 
their base. February to November. (. ovate, acute, rigid, 
unequally serrate, with slightly pungent teeth; lower ones 
opposite; upper ones alternate. Branches succulent, opposite, 
rounded, A. 3ft. 1710. (B. M. 1899, under name of Spiel- 
mannia africana.) 
OGECHEE LIME. See Nyssa capitata. 
OHIGGINSIA. A Hoffmannia 
(which see). 
OHLENDORFFIA (named in honour of Dr. C. F. 
Ohlendorff, of Holstein). Syn. Chilostigma, ORD. Scrophu- 
larinee. A genus comprising nine species mall green- 
house shrubs, rarely herbs, depressed, pro e or tufted, 
now regarded as a synonym of Aptosimum; one is a 
native of Nubia, and the rest are found in tropical 
Africa. Flowers sessile, axillary, bibracteolate; calyx 
deeply five-fid, with narrow, sub-valvate lobes; corolla 
usually bluish, venose, with an enlarged throat, and a 
spreading, oblique, five-fid limb; stamens four. Leaves 
alternate, clustered, entire, one-nerved, oblong-spathu- 
late, linear, or acicular. O. procumbens, the only species 
known to cultivation, thrives in well-drained sandy peat. 
It is propagated by cuttings of half-ripened shoots, 
inserted in gentle heat; or by seeds. 
O. procumbens (procumbent). fl. blue; corolla eight lines long, 
panaia without, with a short narrow tube and a funnel-shaped 
b. August. J. three to four lines long, not opposite, much 
crowded, petiolate, obovate, glabrous, rather thick, very obtuse, 
shortly mucronate. k. 25ft. South Africa, 1836. Undershrub. 
(B. R. 1882, under name of Aptosimum depressum.) 
OIDES. See Odes. 
OIDIUM. A name given to many of the minute 
Fungi included under the name Mildew, at a time 
when they were regarded as distinct and good species, 
without regard to the forms which, it is now known, 
they assume when fully mature. See Mildew. In the 
Oidium stage, the Fungus consists of a white coating 
over all parts of the infested plants. Under the 
microscope, this is seen to consist of a tangled network 
of nearly transparent filaments, made up of cells joined 
end to end. Most of the filaments creep on the surface 
of leaves, or stems, of the host-plants, pushing fine-lobed 
branches into the cells of the latter, to suck food from 
them; while erect filaments stand up over the surface 
of the Fungus. Each filament is made up of a row of 
cells, and those at its tip, after a time, break off, and 
fall away from the lower part, as reproductive bodies 
(conidia); these in some Fungi are globular, in others 
barrel-shaped, or nearly cylindrical. But many of the 
Fungi formerly placed in the group called Oidium, when 
traced to their full development, are found to form re- 
productive bodies (spores) in asci, which are inclosed 
in a case, or perithecium, formed of brown cells, closely 
joined side by side. Frequently, many perithecia are 
formed on a patch of the Fungus resembling grains of 
synonym of 
