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Mertens' moss-heather, Mertens' mountain-heather, western bell heather, western moss heather, white heather, white moss-heather, White Mountain-heather

moss-heather, mountain-heather, white heather

Stems

spreading or ascending to erect, forming dense mats, puberulent, glandular-hairy, or glabrous.

decumbent to prostrate, spreading, ascending, or erect, mat-forming, glabrous or hairy.

Leaves

imbricate, somewhat appressed to leaf above, usually 4-ranked;

blade ovate-lanceolate, abaxial groove absent, 3–4.5 × 1–1.5 mm, margins thin but not scarious, without curled hairs at leaf tips, surfaces glabrous to glandular-hairy or sparsely hairy.

blade canoe-shaped, without abaxial groove, or dorsiventrally expanded by marginal outgrowths forming abaxial groove, margins entire, thin or scarious, surfaces glabrous or glandular or hairy.

Pedicels

erect with deflexed tip at anthesis, elongating (or not) and straight in fruit;

bracteoles absent.

Flowers

sepals 2–3 mm, margins entire or erose;

petals connate to 1/3 their lengths, tips recurved, corolla white, campanulate, 5–8 mm;

stamens to 3 mm.

sepals ± distinct, oblong-ovate;

filaments not enlarged at base;

anthers with awns;

ovary subglobose to ovoid;

style cylindric;

stigma capitate.

Capsules

1.5–4 mm.

borne on erect pedicels, subglobose to ovoid.

x

= 13.

Cassiope mertensiana

Cassiope

Distribution
from FNA
AK; CA; ID; MT; NV; OR; WA; AB; BC
[WildflowerSearch map]
[BONAP county map]
from USDA
North America; n Europe; Asia
[BONAP county map]
Discussion

Subspecies 4 (4 in the flora).

Four subspecies were recognized by Piper, based on differences in pubescence of the stems and leaf margins.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Species 18 (3 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Stems hairy, especially when young, glandular hairs absent; leaf blade margins glabrous.
subsp. mertensiana
1. Stems glabrous or sparsely glandular-hairy when young; leaf blade margins glandular-hairy, scattered eglandular-hairy, or glabrous
→ 2
2. Leaf blade margins glabrous
subsp. gracilis
2. Leaf blade margins glandular-hairy or scattered eglandular-hairy
→ 3
3. Leaf blade margins glandular-hairy; stems glabrous or sometimes sparsely glandular-hairy when young.
subsp. californica
3. Leaf blade margins scattered, branched eglandular-hairy, especially when young; stems glabrous when young.
subsp. ciliolata
1. Leaf blades grooved on abaxial surface.
C. tetragona
1. Leaf blades not grooved on abaxial surface
→ 2
2. Leaf blade margins not scarious, without curled hairs at leaf tips.
C. mertensiana
2. Leaf blade margins conspicuously scarious, with curled hairs at leaf tips (at least on young leaves).
C. lycopodioides
Source FNA vol. 8, p. 447. FNA vol. 8, p. 446. Author: Gary D. Wallace.
Parent taxa Ericaceae > subfam. Cassiopoideae > Cassiope Ericaceae > subfam. Cassiopoideae
Sibling taxa
C. lycopodioides, C. tetragona
Subordinate taxa
C. mertensiana subsp. californica, C. mertensiana subsp. ciliolata, C. mertensiana subsp. gracilis, C. mertensiana subsp. mertensiana
C. lycopodioides, C. mertensiana, C. tetragona
Synonyms Andromeda mertensiana
Name authority (Bongard) G. Don: Gen. Hist. 3: 829. (1834) D. Don: Edinburgh New Philos. J. 17: 157. 1834 ,
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