OF ARTS AND SCIENCES. 147 



the injuries from insects to which these and other lactescent plants are 

 esjjccially liable. There are moderately good materials extant in dif- 

 ferent collections of ten or eleven species, and indications of almost an 

 equal number; while many others doubtless remain to reward the la- 

 bors of future exploi'ers of the forest region of Hawaii, a large part 

 of which lies still untrodden by the naturalist. Exclusive of three 

 true Lobelias, and of a striking new Isotoma ? of Kauai or Nihau in 

 Remy's collection, the known species of the Sandwich Islands may all 

 be referred to Gaudichaud's genera Delissea, Cyanea, and Glennontia, 

 three genera which also shade off into each other in a somewhat 

 troublesome manner. The only essential character of Gaudichaud's 

 genus Rollandia, viz. the adnation of the stamineal tube with one side 

 of the tube of the corolla, is as I suppose a mistake. At least it does 

 not occur organically in flowers of the plants which well accord with 

 the (now flowerless) specimen of R. lanceolata collected in Freycinet's 

 voyage, upon which Gaudichaud founded the genus, nor, I believe, in 

 the plant which answers to his more miserable specimen of R. crispa. 

 The former is a good Delissea ; the lattei", having larger and somewhat 

 foliaceous calyx-lobes, is one of the species through which Delissea grad- 

 uates into Cyanea. To the latter genus we may confidently refer 

 Presl's Macrochilus {Lobelia ?) superba, Cham., of which the calyx- 

 lobes are probably incorrectly said to be imbricated in aestivation, and 

 also a new and most remarkable arborescent species, which by its ex- 

 tremely long and apparently petaloid calyx-lobes, equalling the corolla 

 in length, approaches Glermontia ; but these divisions are perfectly 

 separate down to the ovary, almost filiform, spreading in anthesis, and 

 not deciduous. Our Delissece are : — 



1. Delissea lanceolata. Rollandia lanceolata, Gaud. Bot. Voy. 

 Freyc. R. montana on the plate, the upper leaves reduced in size. 

 R. lanceolata var. grandifoUa, A. DC. Prodr. is really just the type of 

 the species, which Gaudichaud characterizes as having " foliis magnis." 



2. Delissea clermontioides. Gaud. Bot. Voy. Bonite, t. 47, 

 which may probably also be D. Kunthiana, t. 77, and even Rollandia 

 Humboldtiana, of the same author, t. 76. 



3. Delissea Delessertiana. Rollandia Delessertiana, Gaud. 1. c. 

 t. 75. We have what may be a variety of this species, pinnatiloha, 

 from Kauai. 



4. Delissea coriacea (sp. nov.) : fruticosa, glabra ; foliis amplis 

 (pedalibus et ultra) oblongo-lanceolatis coriaceis repando-serrulatis basi 



