Hypericum punctatum |
Hypericum lloydii |
|
---|---|---|
spotted St. John's-wort |
sandhill St. Johnswort |
|
Habit | Herbs erect to ascending, with rarely rooting, branching base, 1.3–10.5 dm. | Shrubs, decumbent, straggling and rooting, forming low, rounded clumps or mats, 1–5 dm. |
Stems | clustered, internodes not lined, with black glands scattered all over. |
internodes (4-) or 6-lined at first, then terete. |
Leaves | spreading or ascending, usually sessile, rarely petiolate (to 1 mm); blade elliptic or oblong to lanceolate or triangular-lanceolate, or oblanceolate, 14–40(–58) × 3–17(–22.5) mm, base cordate to narrowly cuneate, margins plane, apex usually rounded to retuse, rarely acute to obtuse, midrib with 3–5 pairs of branches, tertiary veins densely reticulate toward margins, black glands intramarginal (dense) and laminar (scattered). |
blades linear-subulate, 13–25 × 0.5–0.8 mm, base articulated, parallel, margins revolute, apex rounded to retuse, midrib unbranched. |
Inflorescences | subcorymbiform to cylindric, 10–206(–600)-flowered, subsidiary branches narrowly ascending to curved-ascending. |
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 | 8–15 mm diam.; sepals not imbricate, erect in fruit, lanceolate or oblong-lanceolate to elliptic or ovate-elliptic, subequal, (1.5–)2–4 × 0.8–1.6 mm, apex acute to rounded; petals pale yellow, oblanceolate to elliptic, 3–6(–9) mm; stamens (20–)30–60; anther gland black; styles 1–4 mm. |
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 | ovoid to subglobose, 2.5–6 × 2–3.5(–4) mm, with longitudinal vittae or elongate to ovoid vesicles. |
ovoid, 3–4 × 2–2.5 mm. |
Seeds | not carinate, 0.5–0.7 mm; testa linear-reticulate. |
carinate, 0.7 mm; testa not seen. |
2n | = 14, 16. |
|
Hypericum punctatum |
Hypericum lloydii |
|
Phenology | Flowering summer (May–Sep). | Flowering summer (Aug). |
Habitat | Open or slightly shaded, dry to marshy habitats | Dry habitats (pine woods, granite outcrops, roadside embankments), inner coastal plain and foothills |
Elevation | 50–1200 m (200–3900 ft) | 100–300 m (300–1000 ft) |
Distribution |
AL; AR; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; VT; WI; WV; NF; NS; ON; QC
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AL; GA; NC; SC
|
Discussion | Hypericum punctatum has been confused with H. pseudomaculatum; it can almost always be distinguished by style length and anther gland (black in H. punctatum, amber or pellucid in H. pseudomaculatum). D. E. Culwell’s (1970) record of one specimen of the latter from Missouri with a black anther gland could refer to a hybrid; he and other authors agree that such plants are rare, despite the considerable overlap in distribution of these species. Culwell remarked on the unexpected fecundity of the experimentally produced cross H. graveolens × punctatum but nowhere compared the resulting plants with H. ×mitchellianum, a probable hybrid with that parentage (see discussion under H. ×mitchellianum. Both H. punctatum and H. ×mitchellianum (but not H. graveolens) display a ring of 16 chromosomes at meiosis, and Culwell suggested that this phenomenon may imply some degree of pseudogamy in the group. C. R. Bell (1965) recorded n = 7 chromosomes for this species; his illustration shows n = 8. (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. 101. | FNA vol. 6, p. 79. |
Parent taxa | Hypericaceae > Hypericum > sect. Hypericum | Hypericaceae > Hypericum > sect. Myriandra |
Sibling taxa | ||
Synonyms | H. maculatum var. corymbosum, H. maculatum var. heterophyllum, H. maculatum var. subcordifolium, H. maculatum var. subpetiolatum, H. micranthum, H. subpetiolatum | H. galioides var. lloydii |
Name authority | Lamarck: in J. Lamarck et al., Encycl. 4: 164. (1797) | (Svenson) W. P. Adams: Contr. Gray Herb. 189: 32. (1962) |
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