1902] UNDESCRIBED PLANTS FROM CENTRAL AMERICA 261 
scentia, petiolis 14"" longis basi dilatata 12™ latis: Spica strobiliformis 
virescens bracteis 3-4 foliaceis 13-25 longis fulta, bracteis floralibus extus 
pubescentibus intus vinosis 5°" longis 2.5°™ latis apice rotundatis, bracteola 
lineari 28"" longa pubescente, floribus generis adhuc maximis circa 1™ 
longis. Calyx pubescens 10-12™" altus. Corolla glabra 6.5™ longa, tubo 
2.5™ longo, segmentis obovato-ellipticis. Labelli lobi circa 20-25™™ longi, 
postici inaequales 22~25™™ Jati margine erosi, laciniae anticae lineares vel 
oblanceolate 2-5™™ latae. Stamen 3°™ longum 13™™ latum ultra loculos 12" 
longos 17™™ productum. Stigma cano-pubescens semiorbiculare 4™™ latum, 
appendice vix breviore ovali bifido. Ovarium dense pilosum late cylindricum 
11° longum.— Foliorum florumque magnitudine, et horum fabrica insignis. 
uatemala, alt. 350™, Jul. 1901, von Tuerckheim, n. 8015 Pl. Guat. &c., 
qu. ed. Donn. Sm. 
te C. B. Clarke, nov. gen. Commelinacearum.—Cap- 
sula trivalvis, loculis monospermis; caetera Tradescantiae. 
a : lia grandiflora C. B. Clarke (sp. unica).— Calista 
_ Sandiflora Donn. Sm. in Bor. Gaz. 31: 125. 1901. : 
. 
A species cannot remain in Cad/isia, to which genus Donnell Smith 
a from the capsule referred it; as he observes, the stamens and the habit 
we those of Tradescantia Sect. Descantaria. We may either arrange the 
Plant as a new 
he "Subgenus Donnellia of Tradescantia, or call it DONNELLIA 
i “Sen- as here proposed. On the suggestion of Captain Donnell Smith, 
_“ Tay here give reasons for this course. oe 
J Monograph of the Commelinaceae (DC. Monogr., Phan. III) no 
aa. esa to deal with the genera “logically;” the same characters, 
: only con eit pecan genera ( 7radescantia and its allies) constitute genera, 
Sia an subgenera in Comme/ina and Anetlema. The main reason for oe 
Rew nam, (ee. following my predecessors), was to avoid the introduction of 
here follow, ne 'n Particular of a disputed synonymy; and Bentham ~ 
4 me; Convenience has been preferred to any logical system. 
ee may make this more quickly clear. e two sub- co 
Didymoon as genera (in order to make 
7 ; in this case 
