Hypericum lloydii |
Hypericum graveolens |
|
---|---|---|
sandhill St. Johnswort |
mountain St. Johnswort |
|
Habit | Shrubs, decumbent, straggling and rooting, forming low, rounded clumps or mats, 1–5 dm. | Herbs erect, with rooting, creeping base, 3–6.5 dm. |
Stems | internodes (4-) or 6-lined at first, then terete. |
internodes 4-lined at first, soon 2-lined, with black glands on or near lines. |
Leaves | blades linear-subulate, 13–25 × 0.5–0.8 mm, base articulated, parallel, margins revolute, apex rounded to retuse, midrib unbranched. |
spreading, sessile; blade ovate to oblong or lanceolate, 33–65 × 15–27 mm, base cordate to truncate or broadly cuneate, margins plane, apex obtuse to rounded, midrib with 4–5 pairs of branches, tertiary veins densely reticulate toward margins, black glands intramarginal (dense) and, sometimes, laminar (scattered). |
Inflorescences | narrowly pyramidal, 1–3-flowered, with 1–3(–5)-flowered dichasia from to 5 proximal nodes, without additional flowering branches; pedicels 0.5 mm. |
subcorymbiform, (2–)5–14(–22)-flowered, subsidiary branches sometimes narrowly ascending or curved-ascending. |
Flowers | 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. |
20–25(–30) mm diam.; sepals not imbricate, erect in fruit, lanceolate, subequal, 5–7.5(–11) × 1–3 mm, apex acute; petals golden yellow, narrowly obovate, 11–18 mm; stamens 50–90(–103); anther gland black; styles 5.6–12 mm. |
Capsules | ovoid, 3–4 × 2–2.5 mm. |
broadly ovoid, 5–8 × 3.5–5 mm, with longitudinal vittae. |
Seeds | carinate, 0.7 mm; testa not seen. |
not carinate, 0.8–1.1 mm; testa linear-reticulate. |
2n | = 16. |
|
Hypericum lloydii |
Hypericum graveolens |
|
Phenology | Flowering summer (Aug). | Flowering summer (Jun–Aug). |
Habitat | Dry habitats (pine woods, granite outcrops, roadside embankments), inner coastal plain and foothills | Open or partly shaded, moist habitats, dry, rocky roadside banks |
Elevation | 100–300 m (300–1000 ft) | 1200–2100 m (3900–6900 ft) |
Distribution |
AL; GA; NC; SC
|
NC; TN
|
Discussion | The habit, leaf shape, and drier habitats distinguish Hypericum lloydii from H. galioides. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The chromosome count of n = 16 by Adams (in N. K. B. Robson and W. P. Adams 1968) is now regarded as an error; see D. E. Culwell (1970). Hypericum graveolens is a relict species with close relatives in Japan; it hybridizes with H. ×mitchellianum and, probably, also with H. punctatum. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 79. | FNA vol. 6, p. 100. |
Parent taxa | Hypericaceae > Hypericum > sect. Myriandra | Hypericaceae > Hypericum > sect. Hypericum |
Sibling taxa | ||
Synonyms | H. galioides var. lloydii | |
Name authority | (Svenson) W. P. Adams: Contr. Gray Herb. 189: 32. (1962) | Buckley: Amer. J. Sci. Arts 45: 174. (1843) |
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