28 



PAXTON'S FLOWER GARDEN. 



florist's flowers ; tliey are clear yellow, with a few pale cinnamon-brown spots near the base. 

 The lip has one curved stain of the same colour on each side near the base. 



This, the Excavated Oncid, with several others, forms a group in the genus readily 

 known by the sepals being perfectly distinct from each other, and smaller, or at least not 

 larger, than the petals, — or if broader considerably shorter — contrary to what is usual among 

 the neighbouring species. Hence, in the table published with our 26th plate (vol. i., page 

 134) they stood as a sixth section under the name of Pentapetala macropetala. Of that 

 section we will avail ourselves of the opportunity to give an enumeration. 



Vh PENTAPETALA MACROPETALA. 



1. O. convolvulaceum. 



0. rhizomate volubili filiformi, pseudobulbis secus rhizoma distantibus compressis subro- 

 tundis monophyllis, folio piano sessili ovato-oblongo obtuso mucronulato, pedunculis basi 

 squamatis unifloris folio subsequalibus, sepalis liberis petalisque latioribus oblongis acutis paten- 

 tissimis, labello maximo bilobo baseos auriculis linearibus apice dilatatis rotundatis, crista 

 elevata, truncata utrinque lobata verrucis a 2 fronte, columnse alis acute truncatis. 



Native country, Venezuela. Herb. Linden, No. 1444, from the voyage of Eunck and Schlim. 



This most curious plant has the habit of a Bolbophyl rather than of an Oncid, agreeing in that 

 respect with the very different 0. serpens. On a hard twining rhizome appear at the distance of 

 3 or 4 inches, one-leaved pseudobulbs usually springing from the axil of a small leaf; these pseudo- 

 bulbs are thin, nearly round, scarcely an inch long, and each bear a solitary flat leaf about 2 

 inches long. The flowers, which are nearly 2 inches in diameter, grow singly on peduncles scarcely 

 ' longer than the leaves ; they appear to be spotless, but their colour is unknown. 



2. 0. excavatum, Lindl. in Sert. ore/i. sub t. 25. JB. Reg. 1839., misc. 150. 



0. pseudobulbis . . . . , foliis oblongo-ligulatis . . . . , scapo paniculato, bracteis squami- 

 forrnibus membranaceis acutis, sepalis lateralibus obovatis liberis supremo concavo acuto, petalis 

 membranaceis oblongis basi angustatis, labello sessili pandurato apice rotundato emarginato 

 sellffiformi basi cordato convexo fornicatim excavato, crista tuberculata, columnse alis oblongis 

 rotundatis. 



Native country, Peru. 



This has yellow flowers, spotted with brown, and is easily known by the base of the labellum being 

 very convex, a little hollowed out in front, and excavated with a deep pit on the under side. 



3. 0 sessile, this Plate. 



4. 0. sarcodes^i^. in Journ. Hort. Soc. iv.j). 260 ; alias O. Eigbyanum, PaxtonMag., Oct. 1849. 



0. panicula racemosa angusta, sepalis liberis obovatis planiusculis, petalis majoribus 

 unguiculatis obovato-spathulatis repandis, labelli lobis lateralibus nanis serrulatis intermedio 

 maximo undulato repando emarginato, crista lineari apice biloba tuberculosa pubescente, columnse 

 pubescentis clinandrio anguste marginato alis carnosis truncatis glabris. 

 Native country, Brazil. 



