Hypericum kalmianum L.

Kalm's st. john's wort (en)

Species

Angiosperms > Malpighiales > Hypericaceae > Hypericum

Characteristics

Shrubs, erect, forming slender to rounded or flat-topped bush, (1.4–)2–6(–10) dm. Stems: internodes 4-lined at first, then terete. Leaf blades narrowly oblong to oblanceolate or linear, (15–)20–45 × 3–7(–10) mm, base articulated, narrowly cuneate to subattenuate, margins subrecurved to revolute, apex rounded to obtuse, midrib with 9–14 pairs of branches. Inflorescences usually (1–)3–7(+)-flowered <from apical node>, rarely with flowers from 1–2 proximal nodes. Flowers 20–35 mm diam.; sepals deciduous, not enclosing capsule, (4–)5, elliptic or oblong to obovate, subequal, 4–9 × 1.5–5 mm; petals (4–)5, golden yellow, obovate to oblong, 8–15 mm; stamens deciduous, 150–200; ovary (3–)5(–6)-merous. Capsules narrowly ovoid-conic, 7–11 × 4–7 mm. Seeds narrowly carinate, 0.7–1.1 mm; testa subscalariform. 2n = 18.
More
Branching shrub to 1 m; lvs firm, often revolute, articulate at the base, linear to narrowly oblong, 2–4 cm × 3–8 mm; fls 2–3.5 cm wide, in small cymes of 3–7 terminating the branches; stamens very many, distinct; styles (4)5; fr (4)5-locular, narrowly ovoid, 7–10 mm, the style-base persistent as a slender beak; 2n=18. Dunes and rocky shores about Lakes Erie, Huron and Michigan; inland in c. Wis. and along the Ottawa R. in Que. Late June–Aug.
Life form perennial
Growth form shrub
Growth support free-standing
Foliage retention deciduous
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) 1.0
Mature height (meter) 1.5 - 1.8
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color -
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light 4-6
Soil humidity 2-7
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 4-9

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) 30 - 90
Germination temperacture (C°) 10 - 12
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Flower

Hypericum kalmianum flower picture by Yvan Laplante (cc-by-sa)
Hypericum kalmianum flower picture by K O (cc-by-sa)
Hypericum kalmianum flower picture by ben vc (cc-by-sa)

Distribution

Hypericum kalmianum world distribution map, present in Canada and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:433528-1
WFO ID wfo-0000727791
COL ID 3NPQD
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Norysca kalmiana Hypericum lanatum Hypericum kalmianum var. elongatum Hypericum kalmianum