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FNA | Family List | FNA Vol. 6 | Hypericaceae

1b. HYPERICUM Linnaeus sect. BRATHYS
[informal sect. group]

Brathys Mutis ex Linnaeus f.; Hypericum sect. Brathys (Mutis ex Linnaeus f.) Choisy; H. sect. Spachium (R. Keller) N. Robson; H. subsect. Spachium R. Keller; H. sect. Trigynobrathys (Y. Kimura) N. Robson; Sarothra sect. Trigynobrathys Y. Kimura

Herbs, annual or perennial (stems and leaves glabrous except 43. H. setosum); black glands absent. Leaves deciduous (base articulated) or persistent (base not articulated). Flowers 3–15 mm diam.; sepals persistent, (4–)5; petals persistent, (4–)5; stamens persistent, (5–)10–80, usually in continuous or interrupted ring, sometimes in 5 barely discernable fascicles, each of 1–2 stamens; ovary (2–)3(–4)-merous; placentation parietal; styles ± spreading, bases distinct; stigmas capitate or clavate. Seeds not carinate.

Species 148 (16 in the flora): North America, Mexico, West Indies, Central America, South America, Africa, Asia, Pacific Islands (New Zealand), Australia.

SELECTED REFERENCE Webb, D. H. 1980. A Biosystematic Study of Hypericum Section Spachium in Eastern North America. Ph.D. dissertation. University of Tennessee.

1 Herbs annual, wiry; inflorescences: branching mostly monochasial   (2)
+ Herbs annual or perennial, not wiry; inflorescences: branching mostly dichasial   (3)
2 (1) Leaf blades linear or linear-subulate to linear-lanceolate, 5–22 mm, margins recurved to revolute; sepals 3–7 mm; capsule lengths 1–1.2 times sepals.   43 Hypericum drummondii
+ Leaf blades narrowly triangular-subulate to linear-subulate, scalelike, 1–4 mm, margins incurved; sepals 1.5–2.5 mm; capsule lengths 2–2.7 times sepals.   44 Hypericum gentianoides
3 (1) Stems and leaves scabrous-tomentose to pilose; sepal margins setulose-ciliate.   34 Hypericum setosum
+ Stems and leaves glabrous; sepal margins sometimes ciliate, not setulose-ciliate   (4)
4 (3) Leaf blades linear-subulate, 0.2–0.3 mm wide, basal veins 1, midrib unbranched.   35 Hypericum cumulicola
+ Leaf blades not linear-subulate, (0.5–)2–18 mm wide, basal veins 1–7, midrib with 0–4 pairs of branches   (5)
5 (4) Leaf blades leathery; petals golden yellow or orange-yellow; stamens (35–) 50–80   (6)
+ Leaf blades papery to membranous; petals usually bright, golden, or pale yellow, rarely salmon-orange; stamens 5–25   (11)
6 (5) Leaf blades linear-oblong or linear-lanceolate to linear, 0.5–2 mm wide; petals red tinged; stamens 35–50; styles 2.5–5 mm   41. Hypericum paucifolium
+ Leaf blades elliptic, lanceolate, linear-lanceolate, oblong-elliptic, obovate, or ovate, 3–18 mm wide; petals not red tinged; stamens 50–80; styles 2–4 mm   (7)
7 (6) Herbs erect or ± spreading, non-aerenchymatous at base; leaves (main stems) longer than internodes   (8)
+ Herbs erect to ascending, usually ± aerenchymatous (spongiform-thickened) at base; leaves (main stems) mostly shorter than internodes (usually longer in. 31 H. harperi).    
8 (7) Leaf blades (main stem) lanceolate to oblong-elliptic or obovate, 10–30(–50) mm, apex usually acute to acuminate, rarely obtuse; subsidiary inflorescence branches with or without relatively smaller leaves.   32 Hypericum virgatum
+ Leaf blades (main stem) narrowly lanceolate, 10–40(–55) mm, apex acute to acuminate; subsidiary inflorescence branches with relatively smaller leaves.   33 Hypericum radfordiorum
9 Herbs 2–7 dm; leaf blades (main stem) usually broadly to narrowly ovate, rarely elliptic or lanceolate.   29 Hypericum denticulatum
+ Herbs 3–12 dm; leaf blades (main stem) usually lanceolate, sometimes linear-lanceolate or oblong-elliptic, rarely elliptic or ovate   (10)
10 (9) Herbs erect to ascending, branching at base and in inflorescence; leaves strongly ascending to appressed, shorter than internodes, smaller distally.   30 Hypericum erythreae
+ Herbs erect, branching (from long-creeping rhizomes) at base and from mid and distal nodes; leaves ascending to deflexed, mostly longer than internodes, not or scarcely smaller distally.   31 Hypericum harperi
11 (5) Herbs decumbent to ascending, forming loose mats; stigmas scarcely capitate.   42 Hypericum anagalloides
+ Herbs usually erect, not forming loose mats; stigmas broadly capitate   (12)
12 (11) Leaf blades lanceolate, linear, narrowly elliptic, narrowly oblong-elliptic, oblanceolate, oblanceolate-linear, or obovate; capsules broadest proximal to middle   (13)
+ Leaf blades usually elliptic, oblong, broadly oblong-elliptic, ovate, ovate-triangular, round, or suborbiculate, rarely lanceolate; capsules usually broadest at or near middle   (14)
13 (12) Leaf blades lanceolate, narrowly oblong-elliptic, or oblanceolate, (2–)6–12 mm wide, basal veins (3–)5–7; inflorescences usually compact.   36 Hypericum majus
+ Leaf blades linear to oblanceolate-linear or (proximal) oblanceolate to obovate, 0.5–5.5 mm wide, basal veins 1–3(–5); inflorescences usually diffuse.   37 Hypericum canadense
14 (12) Leaf blades (mid and distal) lanceolate-deltate, apex usually subacute; capsules narrowly conic-ellipsoid.   38 Hypericum gymnanthum
+ Leaf blades (mid and distal) elliptic, lanceolate, oblanceolate, oblong, round, suborbiculate, or ovate, apex obtuse to rounded; capsules narrowly ovoid to cylindric-ellipsoid   (15)
15 (14) Leaf blades bicolor, paler abaxially; inflorescences: bracts linear-subulate.   39 Hypericum mutilum
+ Leaf blades concolor; inflorescences: bracts not linear-subulate.   40 Hypericum boreale


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