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19. Tibouchina arthrostemmoides, nov. spec (sect. Diotan- 
thera). 
Fruticosa; ramis obscure tetragonis, junioribus breviuseule 
denseque adpresso-setulosis praecipue ad nodos, vetustioribus 
subglabris; foliis brevissime petiolatis, rigidiuseulis, ovatis, 
basi rotundatis et saepius leviter emarginato-cordatis, apice 
acutis, raargine integerrimis, 7-nerviis nervis intermediis basi 
breviter coalitis, utrinque brevissime subsparseque adpresso- 
strigillosis praecipue subtus ad nervos; floribus majusculis, 
longiuscule pedicellatis, basi minute bibracteolatis, ad apices 
ramulorum paucis subeymosis; calyce densiuseule longeque 
adpresso-strigoso, tubo  eampanulato-oblongo, segmentis 
linearibus, breviuscule ciliatis, tubo paulo longioribus; stami- 
nibus satis inaequalibus, filamentis glabris, connectivo infra 
loculos breviuscule producto, glabro, basi valde incrassato; 
stylo longiusculo, glabro, superne non vel vix incrassato, apice 
truncato. 
« Arbuseula 5-6 m alta, ramosissima. » Rami erecto- 
patuli, graciles, elongati, rigidiuseuli, cinerco-fusci, satis ramu- 
losi. Petiolus gracilis, teretiuseulus, longiuscule denseque 
adpresso-setulosus, 2-6 mm. longus. Folia patula vel subre- 
flexa, internodiis saepius breviora, utrinque siccitate viridi- 
fuscescentia, 4-6 em. longa, 2-5 !/, em. lata, ramealia satis 
minora; nervis crassiusculis, supra satis impressis, subtus 
valde prominentibus; nervulis transversalibus indistinetis. Pe- 
dicelli graciles, teretiuseuli, densiuscule breviterque adpresso- 
sù igillosi, 1-2 em. longi. Bracteolae erectae, rigidiusculae, 
oblongo-lineares, fuscescentes, subglabrae, 2-4 mm. longae. 
Calyx fulvus, tubo 6-7 mm. longo, apice 4 mm. lato, seg- 
mentis erecto-patulis, rigidiusculis, 7-8 mm. longis. Petala 
rubra vel violacea, patula, obovata, apice oblique subtruncata, 
margine vix ciliata, utrinque glabra, 15-17 mm. longa, 
10-12 mm. lata. Staminum filamenta capillaria, purpurascen- 
tia, 6 vel 7.8 mm. longa; antherae lineares, superne salis 
attenuatae, plus minusve arcuatae, 4 vel 6 mm. longae, connect- 
