Rhododendron 'Hotspur Red'
Azalea (Rhododendron 'Hotspur Yellow')

I think Hotspur Yellow is incorrectly listed as species austrinum

RHS says they are of the Hotspur Group from Knaphill and Exbury Azaleas.
https://www.rhs.org.uk/Plants/...

The following information comes from Missouri Botanical Gardens site:
'Hotspur' was introduced in 1934 by Lionel de Rothschild of Exbury Gardens, UK. It was bred using the Knap Hill hybrid, Rhododendron 'George Reynolds', as one of the parents. 'Hotspur' has openly funnel-shaped, frilly edged flowers that are about 4 in. wide and deep orange-red with a yellowish blotch. It is a medium sized azalea that grows 5 to 6 ft. tall and wide. There are several other cultivars in the Hotspur Group that are sold by color, such as 'Hotspur Red' and 'Hotspur Yellow'.

Lin, you're the one that added Hotspur Yellow to our database in April 2015, so you must have run into it somewhere with that species name. If you think this was done in error, propose a name edit, deleting austrinum from the botanical name.

LOL, I don't remember it but I must have seen it listed that way somewhere along the way. I'll submit a proposal for the change. Thanks!