White on white, or more accurately off white on white!

I have to say that Hoya obscura ranks in the top 10 floriferous Hoyas that I have ever owned.

The title pretty much says it all!

This photo won’t happen again as I recently gave away my Hoya bicolor to an enthusiastic new collector.

Once again it is time to move on from our discussion. I am beyond thrilled that I was lucky enough to finally flower this plant! If you are someone who does well with Hoya thomsonii and Hoya lyi, then this is a must have for your collection. I love all three of these plants, I just wish they loved me as much!

Once again both of these are flowering right now so I will take advantage!

Odd bedfellows that other than being in the same genus have nothing to do with one another, but they are both flowering at the same time, so what the heck!

Below is an image comparison slider; move it back and forth to see Hoya yuennanensis on the left and Hoya lyi on the right.

Hoya yuennanensis was first collected in 1915, but was not published until 1936. In 1977 botanists Tsiang & Li believed that H. yuennanensis was a synonym of H. lyi, but Michele Rodda in 2012 said that they are clearly two separate species:

“It is clear from the examination of the lectotypes and of the cited specimens of

Hoya lyi and H. yuennanensis that there are two separate species, both ecologically

and morphologically. Hoya lyi is a small lithophytic species with variable leaves that

can be oval, elliptic or oblong. It is found only on limestone, in deep shade, growing

tightly appressed to the rock surface. Hoya yuennanensis, in contrast, is a more

rampant climber, generally with elliptic or oblanceolate leaves found on siliceous and

limestone outcrops in exposed locations. Both species have white to pale pink

flowers of similar size but they can be easily discriminated by the shape of their

coronas. Hoya lyi has a rather flat-topped corona with rounded and flattened

slightly ascending outer corona lobes while H. yuennanensis has erect corona lobes

with rounded outer processes and a depressed stigmatic head (Fig. 1). They can also

be discriminated in their pollinia: Hoya lyi has smaller pollen masses with an

elongated retinaculum while H. yuennanensis has a massive retinaculum compared to

the size of the pollinium (Fig. 2). For these reasons Hoya yuennanensis should be

reinstated.”

https://www.researchgate.net/publication/259418725_Taxonomy_of_Hoya_lyi_Hoya_yuennanensis_and_Hoya_mekongensis_Apocynaceae_-_Asclepiadoideae

Here are the specifications of the conditions that made Hoya yuennanensis flower for me. Potting substrate was coconut husk mixed with 20% large sponge rock (Perlite). Went outside in June to increasing day length hours, and flowered as the day length shortened in late August. Temperature ranged from day time highs of up to 85 F to night time lows down to around 50 F. Watered with nutrient solution once per week.