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Hoya imperialis J. Lindley var. rauschii E. Regel

 

Hoya imperialis var. rauschii was published in Gartenflora 4 282, tab. 130 (1855) By E. Regel. It is named in honour of Herr Rausch who sent this variety to E. Regel. According to E. Regel Hoya imperialis var. rauschii has a larger corolla than Hoya imperialis var. imperialis. Herr Rausch had both varieties of Hoya imperialis in cultivation. It is not stated where they were collected.

Hoya imperialis var. imperialis was published in

Plant
Leaves: light green, wavy edges, 15-22 cm long and 6-8 cm wide
Growth habit: climbing
Flowers
No. in a cluster: ~ 10
Size: 7.5 cm
Colour: pink
Form: campanulate
Scent: strong
Nectar: yes, a lot!
Lastingness: about two weeks

Edwards´s Botanical Register sub t. 68 (1846) by J. Lindley. Hoya imperialis was collected by Hugh Low in Gumbang Dyaks, Sarawak, Borneo, Malaysia.

Hoya imperalis var. rauschii is a fast grower and it soon becomes a large plant, so it needs a steady support from the beginning. It's easy to grow as long as you water it regularly. It needs more nutrition than other hoyas. I have my plant in a window facing south with no shading and it seems to like it there. The leaves are big, medium green and slightly pubescent. The edges are wavy.

I got my plant in bloom for the first time when it was 1˝ years old. The flowers are quite impressive, measuring over 7 cm. The colour can vary a lot from time to time. I have two problems with this plant. First; it grows so fast it takes over the window completely if I don't cut it down regularly. Second; the scent of the flowers is so strong in the mornings that I'm having an allergic reaction. Well, time will tell what I'll do with it...

Below are some pictures of flower details.


The colour of the flowers varies a lot from time to time. To the left most is a pale umbel of flowers.

To the left is a picture of the pollinarium which measures 2.5 mm.
 

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Copyright © Jeanette Karlsen