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orange-grass, orange-grass St. John's-wort, pineweed, pinweed St. Johnswort

Habit Herbs annual, erect, branches strict, in distal 2/3 or from most nodes, 0.7–6 dm, wiry. Herbs annual or perennial, erect or decumbent at base, not rooting, branches basal, relatively few or none, 1–7 dm.
Stems

internodes 4-lined.

internodes 4-angled.

Leaves

appressed, sessile;

blade narrowly triangular-subulate to linear-subulate, scalelike, 1–4 × 0.4–0.6 mm, subcoriaceous to chartaceous, margins incurved, apex obtuse to rounded, basal vein 1, midrib unbranched.

erect to spreading, sessile;

blade linear-oblong or linear-lanceolate to linear, 5–33 × 0.5–2 mm, leathery, margins plane to revolute, apex acute, basal veins 1(–3), midrib with (0–)1–3 pairs of branches.

Inflorescences

usually pyramidal, 1–24-flowered, branching mostly monochasial.

narrowly V-shaped, 1–50-flowered, branching mostly dichasial.

Flowers

3–5 mm diam.;

sepals lanceolate to narrowly oblong or linear-lanceolate, unequal, 1.5–2.5 × 0.4–0.8 mm, apex acute;

petals orange-yellow to golden yellow, oblong, 2–4 mm;

stamens 5–11, 5 separate or obscurely 5-grouped;

styles 0.8–1.2 mm;

stigmas broadly capitate.

10–15 mm diam.;

sepals narrowly oblong to narrowly lanceolate, subequal to unequal, 3–7 × 0.8–1.6 mm, margins sometimes ciliate, not setulose-ciliate, apex acute;

petals golden yellow to orange-yellow, red-tinged , oblanceolate to obovate, 6–10 mm;

stamens 35–50, irregularly 3-fascicled;

styles 2.5–5 mm;

stigmas broadly capitate.

Capsules

narrowly cylindric-conic, 4–5 × 1–1.2 mm, length 2–2.7 times sepals.

± narrowly ovoid-conic, 4–9 × 2–4 mm.

Seeds

0.4–0.8 mm;

testa markedly ribbed-scalariform.

0.5–0.7 mm;

testa finely linear-scalariform.

2n

= 24.

Hypericum gentianoides

Hypericum paucifolium

Phenology Flowering late spring–fall (May–Oct). Flowering spring.
Habitat Dry, sandy soil in open woods, fields, roadsides, waste or rocky places, tall-grass prairie Dry, grassy habitats, roadsides
Elevation 0–500 m (0–1600 ft) 0–50 m (0–200 ft)
Distribution
from FNA
AL; AR; CT; DC; DE; FL; GA; IA; IL; IN; KY; LA; MA; MD; ME; MI; MO; MS; NC; NH; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; VT; WI; WV; NS; ON; PE [Introduced in West Indies (Dominican Republic), South America (Brazil, Paraguay), Europe (France)]
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[BONAP county map]
from FNA
TX; Mexico
Discussion

Hypericum gentianoides is smaller in all parts than H. drummondii and more branched. The relatively long, narrow capsule is diagnostic, as are the relatively small, often scalelike leaves.

Hypericum sarothra Michaux and Sarothra hypericoides Nuttall are illegitimate names that pertain here.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

The relatively long styles distinguish Hypericum paucifolium from all other North American species of sect. Trigynobrathys.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 6, p. 95. FNA vol. 6, p. 95.
Parent taxa Hypericaceae > Hypericum > sect. Brathys 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. 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. radfordiorum, H. scouleri, H. setosum, H. sphaerocarpum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
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. perforatum, H. prolificum, H. pseudomaculatum, H. punctatum, H. radfordiorum, H. scouleri, H. setosum, H. sphaerocarpum, H. suffruticosum, H. tenuifolium, H. tetrapetalum, H. virgatum, H. ×mitchellianum
Synonyms Sarothra gentianoides, Brathys gentianoides, H. nudicaule
Name authority (Linnaeus) Britton: Prelim. Cat., 9. (1888) S. Watson: Proc. Amer. Acad. Arts Sci. 25: 143. (1890)
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