Hypericum punctatum |
Hypericum cumulicola |
|
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spotted St. John's-wort |
highlands scrub hypericum, highlands scrub St. Johnswort |
|
Habit | Herbs erect to ascending, with rarely rooting, branching base, 1.3–10.5 dm. | Herbs perennial, erect, branching at or just below ground level and in inflorescence, 2–7.5 dm. |
Stems | clustered, internodes not lined, with black glands scattered all over. |
internodes 4-lined. |
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). |
appressed, sessile; blade linear-subulate, (1–)2.5–4 × 0.2–0.3 mm, subcoriaceous, margins incurved, apex acute, basal vein 1, midrib unbranched. |
Inflorescences | subcorymbiform to cylindric, 10–206(–600)-flowered, subsidiary branches narrowly ascending to curved-ascending. |
subcorymbiform, to 13-flowered, branching mostly dichasial. |
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. |
3–4 mm diam.; sepals ovate to elliptic or narrowly oblong, unequal, 1.5–2 × 0.6–1 mm, margins sometimes ciliate, not setulose-ciliate, apex acute to subacute; petals yellow, obovate-oblong, 3.5–5 mm; stamens 20–25, irregularly arranged; styles 1.5–2 mm; stigmas capitate. |
Capsules | ovoid to subglobose, 2.5–6 × 2–3.5(–4) mm, with longitudinal vittae or elongate to ovoid vesicles. |
narrowly ovoid-conic, subrostrate, 3.5–6 × 1–1.5 mm. |
Seeds | not carinate, 0.5–0.7 mm; testa linear-reticulate. |
0.5–0.6 mm; testa scalariform-reticulate. |
2n | = 14, 16. |
= 12. |
Hypericum punctatum |
Hypericum cumulicola |
|
Phenology | Flowering summer (May–Sep). | Flowering spring–late fall (Mar–Nov). |
Habitat | Open or slightly shaded, dry to marshy habitats | Scrub, on ancient white-sand dunes |
Elevation | 50–1200 m (200–3900 ft) | 50 m (200 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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FL
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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.) |
Of conservation concern. Hypericum cumulicola is confined to Highlands and Polk counties and its habitat is under threat from bulldozers and citrus groves (D. B. Ward 1980); its nearest relative, with the same chromosome number, appears to be H. setosum. Hypericum cumulicola is in the Center for Plant Conservation’s National Collection of Endangered Plants. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 101. | FNA vol. 6, p. 91. |
Parent taxa | Hypericaceae > Hypericum > sect. Hypericum | Hypericaceae > Hypericum > sect. Brathys |
Sibling taxa | ||
Synonyms | H. maculatum var. corymbosum, H. maculatum var. heterophyllum, H. maculatum var. subcordifolium, H. maculatum var. subpetiolatum, H. micranthum, H. subpetiolatum | Sanidophyllum cumulicola |
Name authority | Lamarck: in J. Lamarck et al., Encycl. 4: 164. (1797) | (Small) W. P. Adams: Rhodora 64: 234. (1962) |
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