B25 1S OLD AND NEW GENERA OF PLANTS 
HOUSTONIA SEGREGATES. 
The group of plants aggregated with Houstonia and having 
flowers in typical cymes, and funnel shaped corollas have beside, 
a habit so different from the rest that they well deserve separate 
generic rank. Rafinesque as early as 1820" had suggested the divi- 
sion of the group into several subgenera, and it is one of his names 
which had actually been taken up by Steudel? and is here 
selected for the group. There is as great a difference between these 
plants and the typical Houstonias as between Diodia teres’ and 
typical Diodias the former lately segregated as a genus. These 
latter can in fact be scarcely said to differ as much in habit. 
Chamisme (Raf.) Nwd. Nov. Gen. 
Plantae perennes aliguando suffruticosis ab Houstonia habitu 
distinctae, floribus dimorphicis purpureis vel lilacinis vel albis, 
corollis infundibuliformibus, cymis aggregatis. Alia ut in Houstonia. 
Perennial plants sometimes suffruticose at the base with 
purplish flowers or pale. Corolla funnel shaped: flowers in leafless 
cymes terminal. 
The perennial often suffruticose habit of these plants is a very 
notable distinctive character, showing very little resemblance to 
the tender vernal plants like Houstonia coerulea Linn. which is the 
type of Houstonia proper. 
Type of the genus Houstonia purpurea Linn., Sp. El., 105 (£753) 
Chamisme purpurea (Linn.) Nwd. 
Houstonia purpurea Linn. l..c. 
Chamisme ciliolata (Torr.) Nwd. 
Houstonia -ciliolata ‘Yorr., Fl: INKS So 2 Des) (ees 
Chamisme longifolia (Gaertner) Nwd. 
Houstonia longifolia Gaert., Fruct. I, 226, pl. 49, f. 8, (1788). 
Chamisme tenuifolia (Nutt.) Nwd. . 
Houstonia tenutfolia Nutt., Gen., I, 95 (1818). 
Chamisme angustifolia (Michx.) Nwd. 
Houstonia angustifolia Michx. Fl. Bor. Am. I, 85 (1893), 
Oldenlandia angustifolia (Michx.) A. Gray, Pl. Wright. II, 60 
(1853). 
1 Rafinesque, C. S., An. Gen. Sc. Phys., XV, 226, 227 (1820). 
2 Steudel, EK. T., Nom. Bot., ed. III, 776 (1840). 
3 Small, J. K., Flora of Miami, 174, 175 (1913). 
