On some new Aroideae; with Observations on other known forms. -Part I

N. E. Brown
1880 Journal of the Linnean Society of London Botany  
UNDEB the above title I propose to make known to science some of the numerous undescribed Aroiders contained in the Kew Herbarium, to redescribe or add notes upon imperfectly described or little known species, to give references to figures or descriptions of species which hare been omitted by Prof. Engler in his recent account of the Order in DeCandolle's ' Monographis Phanerogamarum,' vol. ii., and, lastly, to call attention to those species which have been described or figured since the
more » ... red since the publication of that work. This, it is hoped, will form a useful supplement to Engler's monograph, and bring our knowledge of Aroids down to the present date. As regards the limitation of the genera, I have, in most cases, followed Engler; but in their arrangement I prefer to follow Schott, as upon the whole his classification appears to me much the best and simplest that has yet been proposed. The type specimens of all the new species and all the numbers quoted under other species mentioned or described in this part, are preserved in the Kew Herbarium, with the exception of those recently described by other authors, and of Lamont's specimen of Arisrsmo penkillaturn from Hong Kong, which is in the British-Museum Herbarium. Lamina folii late elliptica vel ovata. acutiuscda vel obtusiuscula, tasi cordata, margine eroso-dentata, intra venas valde depresso-bullata. Spatha petiolo longior, tubo cylindrico, limbo in cuspidem suhuliformem quam tubus duplo longiorem prolongato. Spadix 4 poll. longus, syncarpidio* sessili, 6-7 loculari. * The term spcarpidium wm given by Schott to the entire female iufloreacence in this genus, which differs from that of all other Aroids. The one-celled ovaries are in a single whorl around and adnate to the h e of the slender spadix, and are more or lean connate, so as to appear like a several-celled syncsrpic omry, with the slender axis of the spadix rising from its centre. Immediately above the spcarpidium and partly concealed by its styles and stigmas ii e second whorl of minute utterly abortive ovaries. Borneo, ad flumen Lawas (Burbidge !). MB. N. E. BROWN ON SOME NEW AB0II)EIE. 243 A glabrous aquatic. Petioles 2-6 in. long, vaginate at the base, 1-13 line thick. Lamina elliptic, broadly elliptic, or ovate, subacute or obtuse, base cordate, with rounded lobes and a short narrow sinus ; margin erose-dentate (the teeth are formed by the margin being revolute for short semilunar spaces); primary lateral veins four on each side of the midrib, the two lowest pairs arising at the base and excurrent at the margin, the third pair arising a little above the base, and together with the fourth pair, which arises from 4-1 in. above the base of the midrib, uniting again with the midrib near the apex, all 'strongly curved ; rccondary veins transverse between the primary, betaeen them the leaf is strongly depressed-bullate, dark green above, paler beneath. Spathe subsessile, longer than the petioles ; tube cylindric, 2-24 in. long, pallid; limb blackish purple, in the unopened spathe slightly inflated, and prolonged into a subulate erect tail 4-44 in. long. Spadix + lin. long ; syncarpidiutn sessile, 6-7-celled ; stylee linear-subulate, stigmatic down the underside, somewhat spreading. Fruit ovoid, $ in. long, the cells with four eeeds iu each; seeds elongate, falcate, pale brown. Plumule of embryo of four or flve subulatdeaves, arising from the dorsal side a little below the middle. Discovered by Mr. Burbidge in pools, in shady jungles near the Lawas River, North-west Borneo. Mr. Burbidge informs me he found some plants entirely floating, others growing in shallow water with only their leaves floating; it flowers during the dry season, when the water is very shallow. I n the specimens seen by me all the spathes were closed, as represented in my drawing, but probably the base of the limb opens a little. This species seems to be closely allied t o 0. Zongicnuda, Becc., which I have not seen; but, according to Prof. Engler's description of it, my plant differs in its strongly depressed-bullate leaves with erose-dentate margins and an extra pair of primary lateral veins. It is also allied to C. bul2oaa, Becc., from which it differs in its much longer pointed spathe, and to C. Grasthii, Sch., froin nhich it is easily distinguished by its much longer pointed npathe and bdlate leaves. Cnrmoconm CORDATA, art$: The following is an extract from a MS. description of C. cordata, made by Mr. J. Mottley iu Borneo, and now preserved h the Kew Herbarium, which adds to our knowledge of the plant :-LI", J0URN.-BOTANY, VOL. XVIII, T
doi:10.1111/j.1095-8339.1880.tb00650.x fatcat:hlhz2n2z4zbkdhuib2fg42mpz4