Hypericum prolificum |
Hypericum lloydii |
|
---|---|---|
shrubby St. John's-wort |
sandhill St. Johnswort |
|
Habit | Shrubs, erect or ± diffuse, forming rounded or irregular bush, (2–)7.5–15(–20) dm. | Shrubs, decumbent, straggling and rooting, forming low, rounded clumps or mats, 1–5 dm. |
Stems | internodes 4-lined at first, then 2-lined to terete. |
internodes (4-) or 6-lined at first, then 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. |
blades linear-subulate, 13–25 × 0.5–0.8 mm, base articulated, parallel, margins revolute, apex rounded to retuse, midrib unbranched. |
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. |
narrowly pyramidal, 1–3-flowered, with 1–3(–5)-flowered dichasia from to 5 proximal nodes, without additional flowering branches; pedicels 0.5 mm. |
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. |
12–14 mm diam.; sepals deciduous, not enclosing capsule, 5, linear-subulate, unequal, (3–)4.5–7 × 0.5–0.8 mm; petals 5, golden yellow, oblanceolate-oblong, 5–7.5 mm; stamens deciduous, 100; ovary 3-merous. |
Capsules | usually narrowly ovoid-conic to ovoid, rarely ellipsoid, 7–13 × 4–7 mm. |
ovoid, 3–4 × 2–2.5 mm. |
Seeds | carinate, 1.5–2 mm; testa linear-reticulate. |
carinate, 0.7 mm; testa not seen. |
2n | = 18. |
|
Hypericum prolificum |
Hypericum lloydii |
|
Phenology | Flowering summer (Jun–Sep). | Flowering summer (Aug). |
Habitat | Rocky slopes, embankments, dry stream bottoms, woodland (in north), on limestone or granite | Dry habitats (pine woods, granite outcrops, roadside embankments), inner coastal plain and foothills |
Elevation | 50–600+ m (200–2000+ ft) | 100–300 m (300–1000 ft) |
Distribution |
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
|
AL; GA; NC; SC
|
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.) |
The habit, leaf shape, and drier habitats distinguish Hypericum lloydii from H. galioides. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 76. | FNA vol. 6, p. 79. |
Parent taxa | Hypericaceae > Hypericum > sect. Myriandra | Hypericaceae > Hypericum > sect. Myriandra |
Sibling taxa | ||
Synonyms | Brathys prolifica, H. spathulatum, Myriandra ledifolia, M. prolifica, M. prolifica var. spathulata, M. spathulata | H. galioides var. lloydii |
Name authority | Linnaeus: Mant. Pl. 1: 106. (1767) | (Svenson) W. P. Adams: Contr. Gray Herb. 189: 32. (1962) |
Web links |