Hey there Thijs.
I have some questions about the ID of the aloe labeled as massawana in this photo, and I was hoping you would be able to help clear them up. The same issues apply to the plant labeled massawana in this other landscape picture.
I realize the subject came up recently on a thread in the succulent forum, but I was hoping to nail down the ID of these plants before too much time elapses.
The plants in these pictures are not a great match for massawana in a few respects. Based on the shared history of the plants, eumassawana would seem to be a better candidate. The habit is more erect and upright than massawana, which is typically spreading or suberect. The plant appears to be more freely clumping than massawana usually is. The inflorescence seems to be less highly branched (1-3 racemes per inflorescence are predicted for eumassawana, instead of the 3-8 for massawana). The flower color appears closer to orange-red than red/pink.
Here is the 1996 paper where eumassawana was described, along with a revision of massawana restricting it geographically to a southern coastal region in the immediate vicinity of Tanzania.
https://www.researchgate.net/p...
It would be great to confirm the ID of your plants as eumassawana, if that is what the aloes in question really are. We are currently lacking any good pictures for that species in the database.
The key indicators beyond the characteristics mentioned above are flower length (over an inch for massawana, under an inch for eumassawana) and the presence or absence of fine hairs on the inflorescence (massawana lacks them, eumassawana has them on all parts of the raceme, especially young ones). The Carter paper describes these as papillose-puberulent. The bracts should be twice as long as the pedicels on eumassawana, instead of about the same size on massawana.
Finally eumassawana is not generally capable of reproducing by seed (apparently infertile), except for a population from Djibouti which can be distinguished by its unbranched inflorescences. Do your plants make fruit and seed?
https://www.researchgate.net/p...
If you are unable to see fine hairs on young flowers, and/or the plants in your landscape shots make fruit and seed, then they're not eumassawana. In that case I would hazard a guess of maybe officinalis (whose flowers are over an inch but lack the fine hairs), or maybe it would be better to call them Aloe without a species name. If you are able to see the fine hairs on the young flowers, it would be awesome if you could take a revealing pic for the database.
I realize this is a lot of super detailed information, but if you're up for a close inspection of those flowers next time they show up, maybe we can pin the ID down once and for all. (At least until the plants change name again.)