S. candidus, the plant now figured, has pinnatifid leaves, 

 with linear entire rather wavy segments. The flowers are 

 pure white, without a stain of any other colour ; their lower 

 lip has the middle lobe divided into two acuminate flat seg- 

 ments, and the two lateral ones setaceous and shorter. The 

 upper lobe is two-lobed. This was found wild near Coquimbo 

 by Mr. Bridges, whose no. 1356 it is. It is a very pretty 

 half-hardy annual, and well worth cultivation. 



S. Grahami, although figured with large flowers, is really 

 a comparatively small-flowered species. Its leaves are some- 

 thing like those of S. candidus, but they are interruptedly 

 pinnatifid, and more incised. The flowers are lilac, with a 

 yellow upper lip, which is lanceolate acute and undivided ; the 

 lower lip consists of four acuminate incurved lobes, of which 

 the laterals are short. 



Finally, S. retusus, the finest of the genus, has deep rose- 

 coloured flowers, with an orange yellow emarginate oblong 

 upper lip, and a lower with four flat acute lobes, the lateral 

 of which are shorter than the others. 



The following specific characters state the more important 

 differences among the species. 



1. S. pinnatus (Fl. Peruv. 1. t. 17. Bot. Mag. t. 2484. Hooker's Bot. 



Misc. t. 73. S. porrigeus, Graham in Bot. Misc. t. 86.) ; foliis pinnatis 

 laciniis pinnatifidis, corollae labio inferiore trilobo : lobo intermedio 

 cucullato bilobo lateralibus falcatis spathulatis obtusis, labio superiore 

 retuso v. emarginato. 



2. S. pinnatifidus ; foliis angustis pinnatifidis : laciniis rotundatis nanis in- 



tegris, corollae labio inferiore trilobo : lobo intermedio cucullato bilobo 



lateralibus falcatis spathulatis obtusis, labio superiore bilobo. Cap- 



sula S. pinnati sed duplo major. 



3. S. Hookeri (Gillies in Bot. Mag. t. 30/0) ; foliis interrupts pinnatis foliolis 



linearibus serratis, corollae labio inferiore 4-lobo laciniis intermediis 

 falcatis setaceo-acuminatis lateralibus setaceis, labio superiore cuspidato- 

 acuminato. Capsula maxima. 



4. S. candidus; foliis pinnatifidis laciniis linearibus undulatis integris, corollae 



labio inferiore 3-lobo laciniis lateralibus setaceis intermedia biloba acu- 

 tissima, labio superiore alte bilobo. 



5. S. Grahami (Gillies in Bot. Mag. t. 3044) ; foliis interrupte pinnatis 



foliolis linearibus v. oblongis serratis, corollae labio inferiore 4-lobo lobis 



acuminatis incurvis lateralibus abbreviatis, labio superiore lanceolato. 



Capsula minima generis. 



6. S. retusus (Hooker Bot. Mag. t. 3045) ; foliis interrupte pinnatis laciniis 



linearibus obtuse serratis, corollae labio inferiore 3-lobo, laciniis lateralibus 

 abbreviatis intermedia acuta biloba, labio superiore oblongo retuso. 



