Sorbus sect. Sambucifoliae
Sorbus subg. Sorbus
pinnately compound at least proximally;
petiole nodes 5-lacunate;
leaflet margins usually serrate, rarely almost entire.
not papillose abaxially nor glaucous adaxially.
perianth and androecium epigynous.
styles distinct.
red, not glaucous;
sepals persistent;
carpels connate entire length, apex convex.
epidermis single-layered;
flesh without tanniferous cells;
core absent.
buds conic, shiny, not glaucous, glutinous, sparsely hairy, hairs primarily rufous.
buds glutinous or not.
Sorbus sect. Sambucifoliae
Sorbus subg. Sorbus
AK; e Asia (Japan, Russian Far East [Commander Islands, Kuril Islands, Sakhalin])
North America; Eurasia; n Africa; Atlantic Islands [Introduced in Pacific Islands (New Zealand)]
Species 1.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Species 72 (8 in the flora).
Four of the 11 recognized sections of subg. Sorbus occur in the flora area.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Leaflets minutely, densely papillose abaxially (at 70× ); carpels in fruit distinct in distal 1/2, apices convex; winter buds densely hairy, hairs usually whitish, rarely rufous, not glutinous. | S. sect. Sorbus |
1. Leaflets not papillose abaxially; carpels in fruit connate or distinct, apices flat or convex; winter buds glabrous, glutinous, or hairy, hairs usually rufous, sometimes whitish | → 2 |
2. Winter buds mostly glutinous; carpel apices flat or convex. | S. sect. Commixtae |
2. Winter buds never strongly glutinous; carpel apices convex | → 3 |
3. Leaflets not glaucous adaxially; flowers: perianth and androecium epigynous; carpels connate entire lengths; pomes red, not glaucous. | S. sect. Sambucifoliae |
3. Leaflets somewhat glaucous adaxially; flowers: perianth and androecium semiepigynous; carpels distinct most of lengths; pomes pinkish red, glaucous. | S. sect. Tianshanicae |
