[+] Calyx becoming enlarged and berry-like in fruit.
6. Gaultheria. Calyx 5-cleft, in fruit enclosing the capsule. Anthers 4-awned at top.
[+][+] Calyx dry, not becoming fleshy after flowering.
[++] Corolla urceolate to cylindrical, 5-toothed; not heath-like.
7. Andromeda. Calyx valvate and very early open, naked. Capsule globular. Seeds mostly hanging on the central placenta.
8. Oxydendrum. Calyx short, early open, naked. Capsule oblong-pyramidal. Seeds all ascending. A small tree.
9. Leucothoe. Calyx slightly or much imbricated, naked or bibracteate. Corolla cylindraceous. Capsule depressed, 5-lobed, the valves entire.
10. Cassandra. Calyx of rigid imbricated ovate sepals, bibracteate. Corolla cylindraceous. Capsule splitting when ripe into an outer and inner layer, the inner of 10 valves.
[++][++] Corolla campanulate, 4–5-lobed or -parted; heath-like, with acerose imbricated leaves.
11. Cassiope. Calyx of ovate imbricated sepals. Capsule globular-ovoid, 4–5-valved, the valves 2-cleft.