Characteristics of Genus Petrosedum
Groupe des taxons associés à Petrosedum rupestre.
Characteristics of Petrosedum species
Ray Stephenson (Sedum, Cultivated Stonecrops, 1994, pp 116 & 121)
To recognize species of this genus, the following features need to be studied :
Inflorescence reflexed in bud
Petrosedum amplexicaule, P. rupestre, P. reflexum
Inflorescence not reflexed (faces skywards throughout the full development)
P. montanum, [P. thartii], P. ochroleucum, P. pruinatum, P. sediforme, P. erectum
Flowers definitely yellow
P. amplexicaule, P. montanum, [P. thartii], P. pruinatum, P. rupestre
Flowers light straw color
P. ochroleucum, P. sediforme
Plant dries up in summer
P. amplexicaule, P. pruinatum, P. rupestre (sometimes)
Plant remains in growth in summer
P. ochroleucum, P. montanum, [P. thartii], P. pruinatum, P. sediforme, P. rupestre (sometimes)
Inflorescence densely glandular-pubescent (especially sepals and bracts)
P. montanum [(filaments glabrous), P. thartii (filaments usually densely papillose at the base)], P. ochroleucum
Sepals long
P. montanum, P. ochroleucum
Sepals short
P. rupestre, [P. thartii], P. sediforme
Three lobed spurs at the bases of leaves
P. amplexicaule
Petals erect
P. ochroleucum
Leaf shape and other important diagnostic characteristics of genus Petrosedum :