90 JOUKNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Isoloma. — This genus now includes Tydaea and Sciadocalyx. " Sciado- 

 calyx is a name given to Tydaeas which have an umbrella- 

 * like expansion of the cup-like calyx ; there is no other difference ; 

 and as some of the Tydaeas (true) have a calyx nearly approach- 

 ing this form, I do not see why " Sciadocalyx " should be kept up 

 even by horticulturists ; besides it is not very generally in use, so 

 I hope the name may be allowed to lapse. Digit aliflorum and 

 Warszeviczii are the types of Sciadocalyx. 



Tydaea has a corolla much dilated at the mouth of the tube, the 

 lobes spreading and copiously dotted and flaked. Isoloma has a 

 more cylindric tube, more or less contracted at the mouth, the 

 lobes small, the colour of the flower nearly uniform crimson, 

 scarlet, or orange, with slight flaking about the mouth ; Tydaea 

 is an old well-established name, and will not, I think, be readily 

 given up by horticulturists, particularly as it' is easily distin- 

 guished from Isoloma. 



Tydaeas are easily raised from seed, and many coloured varieties 

 result from this mode of propagation, though to perpetuate any 

 variety a cutting or offshoot must be taken. 



Tydaea Section : 



amabile (fig. " Bot. Mag." 4999).— Colombia ; 8,000-9,000 feet 

 elevation. An erect hairy plant, 1-2 feet ; peduncles axillary, 

 solitary, as long as or longer than the leaves, 1 -flowered ; flowers 

 large, villous, dark rose, copiously dotted and blotched ; this is 

 one of the oldest of the Tydaeas, and is, I believe, the parent of 

 most of the hybrids sent out by Continental growers ; these are 

 very numerous and all pretty and worth growing. ' Madame 

 Heine' (fig. "The Garden," xxxiv. 440) and 'Robert le 

 Diable' (fig. "The Garden," xv. 376), two of the oldest of the 

 hydrids, are still, I think, about the best. For other plates of 

 beautiful hybrid Tydaeas see " Fl. des Serres " x. 975 (gigantea), 

 xi. 1181 (ortgiesii), a hybrid between Tydaea Warszeviczii and 

 magnifica, xii. 1190 (eeckhautii) ; "111. Hort." 1858, 160, and 

 1859/ 198, " Gartenflora," vi. 181-2, vii. 218. There is a 

 section of hybrid Tydaeas in which the corolla lobes are 

 much cut and jagged round the edges. Examples, ' Vaca de 

 Castro' (fig. "Garden" [1899], i. 348) and 4 Marquis de 

 Guadiano.' Mr. M. B. Roezl in Mexico has largely hybridised 

 the Isolomas. 



bogfOtense (fig. " Bot. Mag." 4126 as picta). — Bogota. A slightly 

 hairy plant with lovely clouded leaves ; peduncles much longer 

 than the leaves, axillary, solitary, 1 -flowered ; corolla orange and 

 yellow, much spotted. See also "Bot. Beg." 1845, 42; 

 "Fl. des Serres," ser. i., vi. (1850), 165; "Gartenflora," hi. 

 (1854), 110. As there is another Isoloma picta which belongs to 

 the Isoloma section the name of this has been changed in 

 Nicholson's "Diet. Gard." from picta to bogotense — a very 

 beautiful species. 



Ceciliae (fig. "111. Hort." 1876, vol. xxiii. t. 178).— Colombia, 

 riant pilose ; leaves dark velvety, rotund, cordate at base, 



