204 glenny's handbook 



flowers are mistaken b}- persons not skilled in plants for the 

 Forget-me-not — a very different thing. Both are of the easiest 

 culture. The perennial will increase to anj extent by di- 

 vision, and, when once planted, need not be disturbed for 

 years ; for, within moderate limits, the larger the patch of 

 such diminutive subjects the better. It is very suitable for 

 rockwork which is not too dry and exposed. The annual 

 may be sown in the borders towards the end of March, and 

 again in May for a succession, and requires only good garden 

 soil. 



ONOCLEA. [PolypodiaceEe.] Hardy ferns. Peat. Di- 

 vision. O. sensibilis is the chief. 



ONONIS. Resthaerow. [Leguminosse, § Papilionaceag.] 

 A genus of hardy and half-hardy perennials and annuals. 

 Some of the sub-shrubby species are suitable for large rock- 

 work. Sandy loam. Seeds. 



ONOSMA. [Boraginaceae.] Perennial herbs, mostly 

 hardy, and many of them pretty subjects for rockwork. The 

 flowers are tubularly bell-shaped, and in all cases yellow or 

 yellowish. They grow best on dry and rather sandy soil, 

 such as exposed rockwork, being very liable to rot off in damp 

 confined places, and the tenderer ones require protection from 

 wet in winter. When seeds can be got they make the best 

 plants : they should be sown about May, either in pots for 

 subsequent transplantation, or in the situations where they 

 are to remain. If seeds cannot be had they must be increased 

 by cuttings of the young shoots planted in sandy soil, and 

 placed under a hand-glass. 



ONYCHIUM. [Polypodiaceae.] Elegant ferns of easy 

 culture. Turfy peat and loam. Division. 0. Japonicum, 

 greenhouse evergreen fern, is sometimes called 0. lucidum. 



OPHELIA. [Geutianacete.] A pretty annual. Peat 

 border. Seeds, to be sown in heat in April; the young plants 

 planted out in May. O. imrpurascens, flowers purplish. 



OPHIOGLOSSUM. Adder's Tongue. [Ophioglos- 

 sacea3.] Curious hardy plants, related to ferns. Loam. 

 Division. The common 0. vuhjatum and the Jersey 0. Lusi- 

 tanicum are worth introducing among hardy ferns. 



OPHIOPOGON. [Liliacefe.] Hardy and half-hardy 

 perennial. Sandy loam and peat. Division. 



