This post is intended as a reference for Arabian aloes. Please speak up if you have new information or can improve this post. Info adapted from Tom McCoy's book The Aloes of Arabia (2019).
Arabian aloes by year of description
1768 vera
1775 (Forsskål) inermis, officinalis, pendens, vacillans
1880s luntii, perryi, rubroviolacea, sabaeum, squarrosa, tomentosa
1903 forbesii
1960s dhufarensis, eremophila, fulleri, lavranosii, niebuhriana, serriyensis
1970s abyssicola, fleurentiniorum, rivierei
1980s castellorum, sheilae, yemenica
1990s collenetteae, whitcombei, ahmarensis
2000s armatissima, aufensis, austroarabica, brunneodentata, haggeherensis, irafensis, jawiyon, lanata, mahraensis, mccoyi, neoqaharensis, parvicapsula, parvicoma, porphyrostachys, praetermissa, pseudorubroviolacea, saudiarabica, shadensis, woodii
2010s aaata, calliantha, momccoyae, seibanica
By country of origin (*=endemic)
Saudi Arabia (23,15*)
aaata*, armatissima*, aufensis*, austroarabica, brunneodentata*, calliantha*, castellorum, fleurentiniorum, momccoyae*, neoqqaharensis*, officinalis, parvicapsula*, parvicoma*, porphyrostachys*, pseudorubroviolacea*, rubroviolacea, sabaeum, saudiarabica*, shadensis*, sheilae*, vacillans, woodii
Yemen, not including Socotra (27,19*)
abyssicola*, ahmarensis*, austroarabica, casstellorum, dhufarensis, eremophila*, fleurentiniorum, fulleri*, inermis*, irafensis*, lanata*, lavranosii*, luntii*, mahraensis*, mccoyi*, niebuhriana*, officinalis, pendens*, praetermissa, rivierei*, rubroviolacea, sabaeum, seibaninca*, serriyensis*, tomentosa*, vacillans, woodii, yemenica*
Socotra (all endemic)
forbesii*, haggegherensis*, jawiyon, perryi*, squarrosa*
Oman
collenetteae*, dhufarensis, praetermissa, whitcombei*
Flowers with hair
aaata, austroarabica, brunneodentata, lanata, lavranosii, momccoyae, parvicapsula, tomentosa, woodii (all highland aloes)
Pendent
abyssicola, collenetteae, pendens, rubroviolacea, whitcombei, yemenica
Highland aloes (>1000m) (some not exclusively)
aaata, armatissima, aufensis, austroarabica, brunneodentata, calliantha, castellorum, eremophila, fleurentiniorum, irafensis, lanata, lavranosii, luntii, momccoyae, neoqaharensis, niebuhriana, parvicapsula, parvicoma, pendens, porphyrostachys, pseudorubroviolacea, rivierei, rubroviolacea, sabaeum, seibanica, shadensis, sheilae, tomentosa, vacillans, woodii, yemenica
Winter rainfall aloes
calliantha, cephalophora (sheilae), porphyrostachys
dhufarensis complex
dhufarensis, mahraensis, mccoyi
inermis complex (mostly spineless)
inermis, irafensis, luntii, praetermissa
pendens complex (pendent or upright)
neoqaharensis, parvicoma, pendens, rivierei, seibanica, yemenica
rubroviolacea complex (chunky flowers)
aufensis, calliantha, porphyrostachys, pseudorubroviolacea, rubroviolacea, vera
serriyensis complex
abyssicola, ahmarensis, serriyensis
vacillans complex
armatissima, castellorum, shadensis, vacillans
