Flora of North America species comparison

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Hypericum radfordiorum

brushy mountain St. Johnswort
Habit Herbs perennial, erect or ± spreading, branching at base and beyond, (3–)4–7(–7.8) dm.
Stems

internodes 4-lined.
Leaves

ascending to widely spreading, sessile;

blade narrowly lanceolate (linear-lanceolate on axillary branches), 10–40(–55) × 5–10(–13) mm, longer than internodes, leathery, margins plane, apex acute to acuminate, densely gland-dotted, basal vein 1, midrib with inconspicuous branches.
Inflorescences

cylindric, to 40-flowered; branching mostly dichasial, subsidiary branches usually with relatively smaller leaves.
Flowers

8–15+ mm diam.;

sepals lanceolate, unequal (outer slightly wider than inner), 3–6(–7.5) × 1.1–1.8(–2.2) mm, margins sometimes ciliate, not setulose-ciliate, apex acute or acuminate;

petals orange-yellow, obovate, 5–10 mm;

stamens 50–80, filaments basally connate;

styles 2–4 mm;

stigmas capitate.
Capsules

ovoid, 5 × 3–4 mm.
Seeds

0.4–0.8 mm;

testa linear-pitted.
2n

= 24.

Hypericum radfordiorum
Phenology Flowering late spring–fall (May–)Jun–Sep(–Oct).
Habitat Granitic outcrops
Elevation 500–800 m (1600–2600 ft)
Distribution
from FNA
NC
[BONAP county map]
Source FNA vol. 6, p. 90.
Parent taxa Hypericaceae > Hypericum > sect. Brathys
Sibling taxa
H. adpressum, H. anagalloides, H. apocynifolium, H. ascyron, H. boreale, H. brachyphyllum, H. buckleyi, H. canadense, H. canariense, H. chapmanii, H. cistifolium, H. concinnum, H. crux-andreae, H. cumulicola, H. densiflorum, H. denticulatum, H. dolabriforme, H. drummondii, H. edisonianum, H. ellipticum, H. erythreae, H. fasciculatum, H. frondosum, H. galioides, H. gentianoides, H. graveolens, H. gymnanthum, H. harperi, H. hypericoides, H. kalmianum, H. lissophloeus, H. lloydii, H. lobocarpum, H. maculatum, H. majus, H. microsepalum, H. mutilum, H. myrtifolium, H. nitidum, H. nudiflorum, H. paucifolium, H. perforatum, H. prolificum, H. pseudomaculatum, H. punctatum, H. scouleri, H. setosum, H. sphaerocarpum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
Name authority Weakley ex J. R. Allison: Castanea 76: 110, fig. 3. (2011)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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