Hypericum boreale
Hypericum canariense
millepertuis bor é al, northern bog St. John's-wort, northern St. John's-wort
Canary Island st john's wort, Canary Islands St. John's wort
internodes 4-angled, apical internode shorter than adjacent one or almost absent.
internodes 4-lined at first, then terete.
spreading, sessile;
blade (concolor), broadly to narrowly oblong or elliptic to oblanceolate or round, 5–15 × 2–5 mm, papery to membranous, margins plane, apex rounded, basal veins 3–5, midrib branched or not.
spreading, sessile;
blade narrowly elliptic to narrowly elliptic-oblong, 20–70 × 5–15 mm, (proximal usually narrower), base narrowly cuneate to subangustate, margins plane, apex acute to apiculate-obtuse, midrib with 8–12 pairs of branches, tertiary veins densely reticulate toward margins.
cylindric to rounded-pyramidal, 1–13-flowered, branching mostly dichasial;
bracts not linear-subulate.
broadly rounded-pyramidal to broadly cylindric, to 30-flowered.
3–5 mm diam.;
sepals usually lanceolate to narrowly oblong, rarely oblanceolate, equal, 2.5 × 0.8–1 mm, margins sometimes ciliate, not setulose-ciliate, apex rounded;
petals pale yellow, oblong, 1.7–3.5 mm;
stamens 5–16, scarcely grouped;
styles 0.5 mm;
stigmas broadly capitate.
sepals lanceolate, unequal, 3–4.5 × 1–2.2 mm;
petals bright yellow, not red-tinged, oblanceolate-unguiculate, 12–17 mm;
anther gland yellow to orange;
styles widely spreading, 8–14 mm.
narrowly ovoid to cylindric-ellipsoid, 4–5 × 2–2.5 mm, usually broadest at or near middle.
pyramidal-ovoid to ovoid-ellipsoid, 9–12 × 7–8 mm.
0.4–0.7 mm;
testa finely linear-scalariform.
1.5–2 mm, narrowly winged;
testa linear-reticulate to linear-foveolate.
= 16 [“18”].
= 40.
Hypericum boreale
Hypericum canariense
Where Hypericum boreale grows submerged, the plants are almost always sterile with elongated stems and suborbiculate leaves (H. boreale forma callitrichoides Fassett). Such plants intergrade shorewards with typical H. boreale (F. H. Utech and H. H. Iltis 1970). All other chromosome counts for H. mutilum and its near relatives have given n = 8; B. M. Kapoor’s (1972) count of 2n = 18 must be treated with reserve.
Hypericum mutile var. boreale (Britton) E. P. Bicknell is not a validly published name.
The discovery of Hypericum boreale near the mouth of Fraser River at Vancouver in 1989 extends the distribution of this species across Canada almost to the Pacific coast; this occurrence is almost certainly the result of recent introduction.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Hypericum canariense is established at Montecito and Santa Barbara in the hills (P. A. Munz 1974) and along the coast north of Santa Cruz to San Francisco, at locations in Orange and San Mateo counties, and in the San Diego coast region.
The description above agrees with that for Hypericum floribundum regarding sepals lanceolate and acute; in typical H. canariense they are oblong-spatulate and rounded. The variation is continuous; only one species is recognized here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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