THE BOOK OF GARDENING. 



Potentillas (Cinquefoils) are free-flowering plants, of easy 

 culture in the mixed border* Readily increased by seeds or by 

 division. P. argyrophylla, known also as insignis,, is an 

 excellent border-plant, attaining a height of 2ft; it has fine 

 silvery foliage, and yellow flowers lin. in diameter. The variety 

 atrosanguinea has dark crimson flowers, produced from May 

 onwards during the summer. P. nepalensis (syn. P. formosa) is 

 a plant growing from i8in. to 2ft. high, and yielding an 

 abundance of flowers from June to August.; they are rosy- 

 pink in colour, with dark centres. This is an excellent 

 plant for the mixed border or for back positions in the 

 rock garden. 'Numerous florists' varieties are also, grown {see 

 "Appendix"). ' 



Pyrethrums are effective border plants, thriving in any good 

 garden soil. They are now included under Chrysanthemum,,. 



Easily increased by either, 

 seeds, cuttings, or division. 

 P. parthenifolium aureum is 

 well known under the name 

 of " Golden Feather," and 

 is largely used in summer- 

 bedding arrangements, as 

 described in the Chapter 

 "On Bedding Plants." P. 

 * d Parthenium (Common Fever- 

 few) is a fine border plant, 

 growing 2ft. high, and pro- 

 ducing its white flowers with 

 yellow disks during June. 

 The whole plant has a very 

 strong smell. Its variety 

 flore-pleno is a handsome 

 plant, and differs only in 

 having double White flowers. 

 P. roseum is a plant, growing 

 from ift. to 2ft. high, and 

 flowering during June and July ; the florets of the disk are yellow, 

 whilst those of the ray are rose-coloured. P. roseum flort-pkno 

 (Fig. 161) grows upwards of 2ft: high, and produces an abundance 

 of showy semi-double rose-coloured flowers, which are greatly 

 prized for cutting purposes. P. Tchihatchewii (Russian Daisy) 

 is a valuable plant for dry banks and slopes, or for growing 

 under trees, in which position it retains its green colour, even 

 during dry weather. The leaves are very much divided; the 

 stems grow cjin. high, and bear small white flowers with yellow 

 disks. P. uliginosum. (see Chrysanthemum uliginosum). : Ak large 

 number of florists' varieties of Pyrethrums are now in cultiva- 

 tion, and these form splendid subjects- for the mixed border. 



Fig. 161. — Pyrethrum roseum 

 flore-pleno. 



