Hypericum lloydii |
Hypericum gymnanthum |
|
---|---|---|
sandhill St. Johnswort |
claspingleaf St. Johnswort, small-flower St. John's wort |
|
Habit | Shrubs, decumbent, straggling and rooting, forming low, rounded clumps or mats, 1–5 dm. | Herbs annual, usually erect, sometimes shortly decumbent and rooting, basal branches none, rarely with 1–3(–6) pairs of narrowly ascending branches distally, 0.6–7 dm. |
Stems | internodes (4-) or 6-lined at first, then terete. |
internodes 4-angled. |
Leaves | blades linear-subulate, 13–25 × 0.5–0.8 mm, base articulated, parallel, margins revolute, apex rounded to retuse, midrib unbranched. |
spreading, sessile or amplexicaul; blade usually ovate-triangular to broadly ovate, rarely oblong (mid and distal blades lanceolate-deltate), 5–25 × 3–12 mm, papery to membranous, margins plane, apex usually subacute, basal veins (3–)5, midrib usually with 1–2 pairs of branches. |
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. |
laxly corymbiform to cylindric, (1–)5–65-flowered, branching mostly dichasial. |
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. |
4.5–7 mm diam.; sepals lanceolate to narrowly ovate, equal, 3–5 × 0.8–1.2 mm, margins sometimes ciliate, not setulose-ciliate, apex acute to acuminate; petals bright yellow, oblanceolate, 2–4 mm; stamens 10–14, scarcely grouped; styles 0.5–0.7 mm; stigmas broadly capitate. |
Capsules | ovoid, 3–4 × 2–2.5 mm. |
narrowly conic-ellipsoid, 3–5 × 1.5–2 mm, usually broadest at or near middle. |
Seeds | carinate, 0.7 mm; testa not seen. |
0.5–0.6 mm; testa finely linear-scalariform. |
2n | = 16. |
|
Hypericum lloydii |
Hypericum gymnanthum |
|
Phenology | Flowering summer (Aug). | Flowering summer (Jun–Sep). |
Habitat | Dry habitats (pine woods, granite outcrops, roadside embankments), inner coastal plain and foothills | Bogs, ditches, open and cleared woods, damp habitats |
Elevation | 100–300 m (300–1000 ft) | 0–400 m (0–1300 ft) |
Distribution |
AL; GA; NC; SC
|
AL; AR; DE; FL; GA; IL; IN; LA; MD; MO; MS; NC; NJ; OH; PA; SC; TN; TX; VA; Central America (Guatemala) [Introduced Atlantic Islands (Azores)]
|
Discussion | The habit, leaf shape, and drier habitats distinguish Hypericum lloydii from H. galioides. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Hypericum gymnanthum was introduced into Poland; it is now extinct there. It is closely related to H. mutilum; it differs from that species in the broader, usually deltate leaves; fewer, stricter branches; no condensed apical stem internode; and larger flowers with lanceolate to ovate sepals. Hybrids of Hypericum gymnanthum with H. mutilum have been reported from Maryland, Mississippi, North Carolina, Tennessee, and West Virginia, and, perhaps erroneously, with H. canadense from Virginia. Hypericum gymnanthum has clearly been introduced (recently?) into the Azores, not necessarily by man. Seeds may well have been carried there by birds. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 79. | FNA vol. 6, p. 93. |
Parent taxa | Hypericaceae > Hypericum > sect. Myriandra | Hypericaceae > Hypericum > sect. Brathys |
Sibling taxa | ||
Synonyms | H. galioides var. lloydii | H. canadense var. cardiophyllum, H. mutilum var. gymnanthum, Sarothra gymnantha |
Name authority | (Svenson) W. P. Adams: Contr. Gray Herb. 189: 32. (1962) | Engelmann & A. Gray: Boston J. Nat. Hist. 5: 212. (1845) |
Web links |