Collinsonia 



(231 ) 



Colorado Beetle 



known annual. Propagated by seeds, sown in 

 s-pring where tlie plants are to bloom, and thinned 

 out lo 2" or 3" apart. For early flowering sow in 

 a sheltered place in autumn, protect in severe 

 weather with branches or mats, and transplant in 

 spring. Ordinary garden soil, previously well dug 

 and manured, will do. Those sown in autumn 

 should be in poorer soil during winter. 



Principal Species : 

 tricolor, 1', Aug. , pur. , wh. 

 alba, wh. 

 grandinora, 1', Jy., pur., 



bl. 



Other Species : 

 liartsia'folia, 1', Je., pur. 

 bicolor heterophylla, 2', 



Jy., m. 



t'orymbnsa, 1', Jy.,wh.,bl. 

 multicolor, 1J', My., In. 



verna, t', My., wh., bl. 

 A pretty auu. in spr. 



parviflora, l',Je.,pur. bl.: 



trailer. 



spar.sitlora, 1'. My., vio. 

 tiuctoria, 1', My., pk. 

 violacea, 9", Je., vio. 



COLLINSONIA. 



1'erennial herbaceous plants (urd. Labiata?), little 

 grown in gardens on account of their rather coarse 

 habit. They like a rather moist and peaty soil, 

 but will grow in any border. They are propagated 

 by division in spring. The species grown are 

 anisata, 2J', October, yellow ; canadensis, 4', Sep- 

 tember, yellow (xyns. cuneata, decussata, etc.) ; 

 scabriuicula, 2', August, greenhouse, yellow (HI/US. 

 ovalis. tuberosi, etc.) ; anil verticilhita. Anisata 

 is barely hardy. 



COLLOMIA. 



I'rctty, hardy annuals (ord. Polemoniacere), re- 

 lated to, and somewhat like, the Gilias. They 

 may be sown in spring or. autumn; for autumn 

 bloom where they are to flower ; for spring in the 

 reserve garden. The best are coccinea, l.y, June, 

 ml (*.'/. lateritia), and grandifloni. IV. ml yellow 

 (.//. Cavanillesii, not cavanillesiana of D. Don). 

 Others are heterophylla, 1^', July, purple, and 

 linearis, ].'/, June, yellow, brown. Common soil. 



COLOCASIA. 



Description. Stove herbaceous plants {urd. 

 Aroideae), with a tuberous rootstock. There are 

 live species, all hailing from tropical America. 

 The leaves are large and showy, and one species 

 at least Antiqiioruin is cultivated for the sake 

 of its edilili' rootstuek. Taro. 



Propagation. By division of the rootstocks, in 

 I lit- >ame manner as is practised for Caladiums, 

 which sec. 



Soil. Equal parts of rich loam and leaf soil, 

 with coarse sand. 



Other Cultural Points. Antiquorum esculentum 

 is the form generally known in this country. Us 

 huge leaves, nearly 2' in length by 18" broad, give it 

 a noble presence, and the plant is much valued for 

 sub-tropical bedding. The rootstocks are started 

 in In at in earlv March, and crown on in a stove 

 heat until all danger of frost is past. The plants 

 may be grown in pots, but as they need a good 

 deal of root room they are apt to be clumsy. 

 Plenty of water is necessary throughout the grow- 

 ing season, and weak liquid manure is beneficial. 

 The heavv leaves require artificial support. 



Principal Species : 



Antiquorum, 2' to 3'. 



esculentum. '!' to -I', leaves round, heart 

 shaped, of great size, grn.. and with prominent 

 wh. ribs. Formerly regarded as a distinct species 

 {i/n. Caladium esculentum). 



nymphajifolia, stemless. 

 devansayana. 



indica, 5' (correctly Alocasia indica). 

 odorata {see Alocasia oclora). 



COLOGANIA. 



Stove creeping or twining shrubs {ord. Legu- 

 minosse). They may be increased by cuttings 

 formed of the side shoots inserted in sandy soil, in 

 heat ; and by seeds sown under similar conditions. 

 Soil, a mixture of loam, peat, and sand. 



Principal Species: 



IJrou-sonetii, vio., flowers 

 in pairs. 



biloba, 20', sum., aut., 

 vio. 



Other Species : 



angustifolia. pulchella. 



COLORADO BEETLE. 



This destructive beetle (Doryphora decemlineata) 

 is well known in the United States. It was first 

 discovered in the Rocky Mountains, in the Colorado 

 district, whence the name. It was then observed 

 to be feeding on a wild Solatium, but it has since 

 transferred its attentions to 'the cultivated Potato. 

 It reached the Atlantic coast in 187(i, and is now 

 common all along the eastern American coast. 

 Alarm was taken in 1877 that it would spread to 

 this country, and in that year the Privy Council 

 passed an Act enjoining any person finding it to be 

 present in his Potatoes to give notice to the local 

 police. Also in 1877 the beetle was discovered at 



COLEUS DECORATOR (ep. 230.) 



Miilheim, on the Rhine, and in several localities 

 in S.ixony, and it was only by the vigilance and 

 prompt action of the Government that it was got 

 rid of. In 1901 the pest made its first appearance 

 in Knirland, being found at Tilbury, but the ener- 

 getic action of the Hoard of Agriculture soon exter- 

 minated it. In America, spraying with Paris Cn-.'ii 

 has been found effectual, and it is probable that 



Colocynthia (see Citrullvt). 



