288 MONOCOTYLEDONEÆ. TRADESCANTIA. 
rachtia, Kunze in Bot. Zeit. 1850, p. 1. Gonatandra, Schldl. in 
Linnma 24 (1851), p. 659. Descantaria, Schldl. in Linnæa 26 
(1853), p. 140. Mandonia, Hassk. in Flora 1871, p. 260. Skofitzia, 
Hassk. et Kanitz in Oestr. Bot. Zeit. 1872, p. 147. Knowlesia, 
Hassk. Commel. Ind. p. 5. Disgrega, Hassk. Commel. Ind. p. 6. 
Sepala 3, libera, navieularia aut concava, elliptica aut oblonga, 
viridia aut petaloidea, persistentia proventu vix aut non mutata. 
Petala 3, libera, æqualia, breviter unguiculata, rotunda, cærulea pur- 
purascenti-rosea aut alba, marcescentia. Stamina 6 (3 in T. elongata 
var. triandra), libera, hypogyna, fertilia: subæqualia aut 3 petalis 
opposita breviora; filamenta barbata vel nuda ; antheræ loculi ellip- 
soidei aut oblongi, rima longitudinali dehiscentes, approximati sub- - 
paralleli aut sæpiùs connectivo ampliato (interdum late) disjuneti ; 
antheræ in staminibus 3 brevioribus sæpe difformes. Ovarium sessile, 
3-loeulare; loculi 2-ovulati. Stylus linearis aut breviter cylindricus. 
Capsula sicca 3-locularis, loculicide 3-valvis; loculi 2- (casu 1-) spermi. 
Semina superposita, subpyramidata. Hilum breviter lineare, verti- 
cale. Micropyla lateralis, embryostega circulari tecta. Testa siccà, 
nigra, fusca vel cinerea, rugoso-reticulata rarius levis sæpe ab embryo- 
stega quasi radiata. Embryo trochlearis, horizontalis, quoad hilum 
transverse remotus. : 
Flores umbellati, vel raro in paniculis multifloris dense congestl 
in T. nana solitarii; umbellæ sessiles bracteis foliæformibus spatha- 
ceisve involucratæ, aut pedunculatæ; peduneuli solitarii, fasciculatl 
rarius paniculati. 
Species 32, Americanæ, tropicæ et subtropicæ, a Buenos-Ayres 
usque ad Lacum Winnipeg; una etiam in insulis Sandwich reperta. 
ORDO SECTIONUM ET SPECIERUM 
SECTIO I. — EUTRADESCANTIA. Stamina æqualia aut 3 Y 
breviora; antheræ fere consimiles 
8 1. UMBELLÆ sESSILES l. €. BRACTEA AD BASIM UMBELLÆ LATIUSCULA 
PEDICELLIS LONGIOR : 
i. T. Virgines; Lib. GR tV aT ec j Umbellæ plerumq®® 
IO A v siet $ terminales. 
