ID? Dendrobium Second Love? Are these Keikis?

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There are many different groups of dendrobiums, with different growth patterns. They are distinctive enough that different groups of Dens can often be recognized by vegetative growth without flowers.

The plant you show is what is called a Dendrobium nobile hybrid, because its ancestry includes species similar to Den. nobile. They often make keikis instead of flowers on the stems when fertilized too late in the summer. They tend to have tall stems with many alternate thin, flexible leaves carried almost down to the roots. Flowers with large lips are borne singly or in pairs on very short individual stems from nodes opposite leaves. Leaves drop after a year or two, though canes remain alive and may flower years later.

The antelope Dens, also called Section Spatulata, have flowers with small lips and vertical petals, like antelope horns. The Phalaenopsis Dens, Section Phalaenanthe, have flowers like a Phalaenopsis. Both these groups have taller, thicker canes than nobiles. Leaves are thick and break rather than bend. They tend to be borne near the tops of canes, with a larger proportion of cane leafless than with nobiles, and fewer leaves per cane. Flowers are borne on long, often branching inflorescences from the upper portions of canes.

Den. Second Love (note there are no quotation marks for orchid hybrid names) is a Den. nobile hybrid. Den. Woo Leng is a hybrid between antelope and Den phal species. If those are the two tags you have, the photos in your message belong to Den. Young Love.

The groups have different cultural requirements. Nobile hybrids prefer winter nights 50-55 F / 10-12C with a little less winter water. Spatulatas and Den phals prefer to be warm and moist all year.

You can look up ancestry of your plants on bluenanta.com.