Flora of North America species comparison

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Hypericum prolificum

shrubby St. John's-wort
Habit Shrubs, erect or ± diffuse, forming rounded or irregular bush, (2–)7.5–15(–20) dm.
Stems

internodes 4-lined at first, then 2-lined to terete.
Leaf

blades narrowly oblong to narrowly elliptic-oblanceolate, 30–70 × 6–15 mm, base articulated, attenuate to narrowly cuneate, margins plane to recurved, apex rounded-apiculate to acute, midrib with 10–16 pairs of branches.
Inflorescences

cylindric, (1–)3–7(–9)-flowered from apical node, with paired single flowers or triads or 1–3(–7)-flowered branches from 2+ proximal nodes.
Flowers

15–30 mm diam.;

sepals deciduous, not enclosing capsule, 5, elliptic to obovate or oblanceolate-spatulate, unequal or subequal, 4–8 × 1.5–4 mm;

petals 5, golden yellow, obovate to oblanceolate-spatulate, 7–15 mm;

stamens deciduous, 150–500;

ovary 3(–5)-merous, placentation incompletely axile.
Capsules

usually narrowly ovoid-conic to ovoid, rarely ellipsoid, 7–13 × 4–7 mm.
Seeds

carinate, 1.5–2 mm;

testa linear-reticulate.
2n

= 18.

Hypericum prolificum
Phenology Flowering summer (Jun–Sep).
Habitat Rocky slopes, embankments, dry stream bottoms, woodland (in north), on limestone or granite
Elevation 50–600+ m (200–2000+ ft)
Distribution
from FNA
AL; AR; DC; DE; FL; GA; IA; IL; IN; KY; LA; MD; MI; MO; MS; NC; NJ; NY; OH; OK; PA; SC; TN; TX; VA; WI; WV; ON
[WildflowerSearch map]
[BONAP county map]
Discussion

Hypericum prolificum is variable, the most luxuriant form being found in the southwestern part of its range. Natural hybrids have not been recorded; it hybridizes in gardens with H. densiflorum (H. x\arnoldianum Rehder), H. frondosum, H. kalmianum, and H. lobocarpum (H. x\dawsonianum Rehder).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 76.
Parent taxa Hypericaceae > Hypericum > sect. Myriandra
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. pseudomaculatum, H. punctatum, H. radfordiorum, H. scouleri, H. setosum, H. sphaerocarpum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
Synonyms Brathys prolifica, H. spathulatum, Myriandra ledifolia, M. prolifica, M. prolifica var. spathulata, M. spathulata
Name authority Linnaeus: Mant. Pl. 1: 106. (1767)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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