Tas. 5285. 
DENDROBIUM TRIADENIUM. 
Three-knobbed Dendrobium. 
Nat. Ord. OrncHIpE#®.—GyYNANDRIA MONANDRIA. 
Gen. Char. Sepala membranacea, erecta vel patentia, lateralibus majoribus 
obliquis, cum basi producta columnz connatis. Pefala sepalo supremo sepius 
majora, nunc minora, semper membranacea. Labellum cum pede columne arti- 
culatum vel connatum, semper sessile, indivisum vel trilobum, sepius membra- 
naceum, nunc appendiculatum. Columna semiteres, basi longe producta. dn- 
thera bilocularis. Pollinia 4, per paria collateralia.—Herbe epiphyte, nunc 
caulescentes, nunc rhizomate repente pseudobulbifero. Folia plana, sepius venosa. 
Flores solitarii, fasciculati, vel racemosi, speciosi. Lindl. 
Denprosrum (§ Onychium) ériadenium ; radicibus villosis, caulibus elongatis 
teretibus ramosis basi fusiformibus, foliis ovato-oblongis obtusis, panicula 
brevi terminali confertiflora racemosa, sepalis ovatis acutis, petalis labelloque 
oblongis undulatis rotundatis emarginatis hoc glabro utrinque unidentato, 
medio tuberculo tricrenato aucto, mento brevi obtuso, columna apice den- 
tata, stigmate villoso. Lindl. 
DENDROBIUM triadenium. Lindl. in Bot. Reg. 1846, sub t. 64, e¢ v. 33. ¢. 1. 
This agrees in all respects with the plant above referred to, and 
the figure there quoted, of Dr. Lindley, save in the absence of 
the rather deep rose-coloured maculz on the sepals and petals, 
of which but a faint tinge is here seen, and in the absence of the 
bright orange-colour at the tips of the glands on the labellum : 
it is therefore less ornamental. The species has been now long 
cultivated in our orchideous collections, and is supposed to be a 
native of the Malay Archipelago. Introduced by Messrs. Rol- 
lison, of Tooting. Flowers with us in September. 
Descr. Stems, rather than pseudobulbs, clustered, throwing 
out downy, fleshy, vermicular radicles, erect, ten inches to a foot 
or a foot and a half long, rather slender, jointed, striated, sheath 
ing, swollen upwards. eaves numerous, distichous, elliptical, 
sessile, subcordate at the base, thick, fleshy, very obtuse, gradu- 
ally smaller upwards. Panicle short, terminal, bearing about 
ten to twelve, moderately large, white flowers, more or less dis- 
DECEMBER lst, 1861. 
