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| 1 |
Herbs annual, wiry; inflorescences: branching mostly monochasial |
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(2) |
| + |
Herbs annual or perennial, not wiry; inflorescences: branching mostly dichasial |
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(3) |
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| 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. |
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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. |
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44 Hypericum gentianoides |
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| 3 (1) |
Stems and leaves scabrous-tomentose to pilose; sepal margins setulose-ciliate. |
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34 Hypericum setosum |
| + |
Stems and leaves glabrous; sepal margins sometimes ciliate, not setulose-ciliate |
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(4) |
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| 4 (3) |
Leaf blades linear-subulate, 0.2–0.3 mm wide, basal veins 1, midrib unbranched. |
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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 |
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(5) |
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| 5 (4) |
Leaf blades leathery; petals golden yellow or orange-yellow; stamens (35–) 50–80 |
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(6) |
| + |
Leaf blades papery to membranous; petals usually bright, golden, or pale yellow, rarely salmon-orange; stamens 5–25 |
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(11) |
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| 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 |
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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 |
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(7) |
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| 7 (6) |
Herbs erect or ± spreading, non-aerenchymatous at base; leaves (main stems) longer than internodes |
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(8) |
| + |
Herbs erect to ascending, usually ± aerenchymatous (spongiform-thickened) at base; leaves (main stems) mostly shorter than internodes (usually longer in. 31 H. harperi). |
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| 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. |
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32 Hypericum virgatum |
| + |
Leaf blades (main stem) narrowly lanceolate, 10–40(–55) mm, apex acute to acuminate; subsidiary inflorescence branches with relatively smaller leaves. |
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33 Hypericum radfordiorum |
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| 9 |
Herbs 2–7 dm; leaf blades (main stem) usually broadly to narrowly ovate, rarely elliptic or lanceolate. |
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29 Hypericum denticulatum |
| + |
Herbs 3–12 dm; leaf blades (main stem) usually lanceolate, sometimes linear-lanceolate or oblong-elliptic, rarely elliptic or ovate |
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(10) |
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| 10 (9) |
Herbs erect to ascending, branching at base and in inflorescence; leaves strongly ascending to appressed, shorter than internodes, smaller distally. |
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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. |
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31 Hypericum harperi |
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| 11 (5) |
Herbs decumbent to ascending, forming loose mats; stigmas scarcely capitate. |
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42 Hypericum anagalloides |
| + |
Herbs usually erect, not forming loose mats; stigmas broadly capitate |
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(12) |
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| 12 (11) |
Leaf blades lanceolate, linear, narrowly elliptic, narrowly oblong-elliptic, oblanceolate, oblanceolate-linear, or obovate; capsules broadest proximal to middle |
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(13) |
| + |
Leaf blades usually elliptic, oblong, broadly oblong-elliptic, ovate, ovate-triangular, round, or suborbiculate, rarely lanceolate; capsules usually broadest at or near middle |
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(14) |
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| 13 (12) |
Leaf blades lanceolate, narrowly oblong-elliptic, or oblanceolate, (2–)6–12 mm wide, basal veins (3–)5–7; inflorescences usually compact. |
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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. |
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37 Hypericum canadense |
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| 14 (12) |
Leaf blades (mid and distal) lanceolate-deltate, apex usually subacute; capsules narrowly conic-ellipsoid. |
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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 |
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(15) |
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| 15 (14) |
Leaf blades bicolor, paler abaxially; inflorescences: bracts linear-subulate. |
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39 Hypericum mutilum |
| + |
Leaf blades concolor; inflorescences: bracts not linear-subulate. |
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40 Hypericum boreale |
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