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round-fruit St. John's-wort, roundseed St. Johnswort

Canary Island st john's wort, Canary Islands St. John's wort

Habit Herbs (perennial) or subshrubs, erect or decumbent, not or rarely rhizomatous, unbranched or branched proximally, 2–6 dm. Shrubs erect, bushy, 10–50 dm.
Stems

internodes 2–4-lined.

internodes 4-lined at first, then terete.

Leaves

blades narrowly elliptic or narrowly oblong to linear, 30–70 × 3–15 mm, base not articulated, narrowly cuneate to linear, margins plane to revolute, apex subacute to rounded, midrib with 0–4 pairs of branches.

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.

Inflorescences

rounded-corymbiform, 7–70-flowered, narrowly branched, sometimes with dichasia or branches from to 8 proximal nodes.

broadly rounded-pyramidal to broadly cylindric, to 30-flowered.

Flowers

10–15 mm diam.;

sepals persistent, not enclosing capsule, 5, broadly ovate to oblong-elliptic, ± unequal, 2.5–5 × 1.5–3 mm;

petals 5, bright yellow, oblanceolate-elliptic to elliptic, 5–9 mm;

stamens persistent, 45–85;

ovary 3-merous, placentation parietal.

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.

Capsules

broadly ovoid to depressed-globose, 4.5–8 × 4–7 mm.

pyramidal-ovoid to ovoid-ellipsoid, 9–12 × 7–8 mm.

Seeds

carinate, 2–2.7 mm;

testa coarsely reticulate.

1.5–2 mm, narrowly winged;

testa linear-reticulate to linear-foveolate.

2n

= 40.

Hypericum sphaerocarpum

Hypericum canariense

Phenology Flowering summer (Jun–Aug). Flowering spring–summer.
Habitat Rocky outcrops or embankments, prairies, stream banks, usually wet or moist, railroad embankments Disturbed sites
Elevation 500–1000 m (1600–3300 ft) 20–500 m (100–1600 ft)
Distribution
from FNA
AL; AR; IA; IL; IN; KS; KY; MI; MO; MS; NE; OH; OK; TN; TX; WI; ON
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; Atlantic Islands (Canary Islands, Madeira) [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Discussion

Hypericum sphaerocarpum differs from H. cistifolium and H. nudiflorum in its semiherbaceous habit and more northwestern distribution, as well as in its combination of relatively long, narrow leaves, persistent sepals, globose and apiculate to rounded capsules, and relatively large seeds. The narrow-leaved, bushy form from eastern parts of the range (var. turgidum) merges with the typical form.

(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.)

Source FNA vol. 6, p. 83. FNA vol. 6, p. 96.
Parent taxa Hypericaceae > Hypericum > sect. Myriandra Hypericaceae > Hypericum > sect. Webbia
Sibling taxa
H. adpressum, H. anagalloides, H. apocynifolium, H. ascyron, H. boreale, H. brachyphyllum, H. buckleyi, H. canadense, H. canariense, H. chapmanii, H. cistifolium, H. concinnum, H. crux-andreae, H. cumulicola, H. densiflorum, H. denticulatum, H. dolabriforme, H. drummondii, H. edisonianum, H. ellipticum, H. erythreae, H. fasciculatum, H. frondosum, H. galioides, H. gentianoides, H. graveolens, H. gymnanthum, H. harperi, H. hypericoides, H. kalmianum, H. lissophloeus, H. lloydii, H. lobocarpum, H. maculatum, H. majus, H. microsepalum, H. mutilum, H. myrtifolium, H. nitidum, H. nudiflorum, H. paucifolium, H. perforatum, H. prolificum, H. pseudomaculatum, H. punctatum, H. radfordiorum, H. scouleri, H. setosum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
H. adpressum, H. anagalloides, H. apocynifolium, H. ascyron, H. boreale, H. brachyphyllum, H. buckleyi, H. canadense, H. chapmanii, H. cistifolium, H. concinnum, H. crux-andreae, H. cumulicola, H. densiflorum, H. denticulatum, H. dolabriforme, H. drummondii, H. edisonianum, H. ellipticum, H. erythreae, H. fasciculatum, H. frondosum, H. galioides, H. gentianoides, H. graveolens, H. gymnanthum, H. harperi, H. hypericoides, H. kalmianum, H. lissophloeus, H. lloydii, H. lobocarpum, H. maculatum, H. majus, H. microsepalum, H. mutilum, H. myrtifolium, H. nitidum, H. nudiflorum, H. paucifolium, H. perforatum, H. prolificum, H. pseudomaculatum, H. punctatum, H. radfordiorum, H. scouleri, H. setosum, H. sphaerocarpum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
Synonyms Brathydium chamaenerium, B. sphaerocarpum, H. chamaenerium, H. sphaerocarpum var. turgidum, H. turgidum H. floribundum, Webbia canariensis, W. floribunda
Name authority Michaux: Fl. Bor.-Amer. 2: 78. (1803) Linnaeus: Sp. Pl. 2: 784. (1753)
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