Dendrobium polyanthum aka Dendrobium primulinum var. Laos, the flowers of two different clones.

About a decade ago there was a large importation of plants of Dendrobium polyanthum to the island of Puerto Rico, in fact they also seem to have been sold in the United States.  Some ot these plants have survived and bloomed.  The top photo is a flower from a plant that I grew from a keiki.  The flower has a large yellow area in the labellum.  The bottom flower is from a plant that I brought as an adult, the area of yellow is smaller than in the flower on top but the labellum is larger.  The plant that produced the flower on top is a slow deliberate grower that is somewhat delicate, the plant that produced the flower on the bottom is a vigorous grower and blooms relatively well.

Dendrobium prenticei [F. Mueller]Nichols 1938, usually known as Dendrobium lichenastrum var. prenticei

This small orchid is cultivated by a few people on the island.  It is grown mainly by species growers.  The flowers are small.  This orchid can form a specimen in a fairly small space.

Paphiopedilum roebbelenii [Rchb.f] Pfitzer 1894, a variety of Paph. phillippinese

This plant is almost identical to Paph. phillippinense. The traits that distinguish roebblenii are; the petals, which are much longer than in typical Paph. phillipinese, the petals are much curlier and the flower are larger in roebbelenii.  These plants are quite rare in Puerto Rico, I have ony seen three plants of this variety, all differed slighlty from each other.  The pose no difficulty to grow in Puerto Rico.