Flora of North America species comparison

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Hypericum mutilum subsp. mutilum
Photo is of parent taxon

dwarf st john's wort, millepertuis nain, small Canadian St. John's-wort
Stems

apical internode shorter than adjacent one or almost absent.
Leaf

blades variable, rarely broadly ovate or suborbiculate.
Inflorescences

branching from 2–10 nodes, mostly dichasial.
Sepals

not imbricate or broader beyond middle or, if imbricate, leaves not broadly ovate to suborbiculate.
2n

= 16.

Hypericum mutilum subsp. mutilum
Phenology Flowering summer–fall (Jun–Oct).
Habitat Ditches, marshes, lake margins, desiccated temporary pools
Elevation 0–400 m (0–1300 ft)
Distribution
from FNA
AL; AR; CA; CO; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; ME; MI; MO; MS; NC; NE; NH; NJ; NY; OH; OK; OR; PA; RI; SC; TN; TX; UT; VA; VT; WA; WI; WV; BC; NB; NS; ON; QC; SK [Widely introduced in Central America, South America, Europe, Pacific Islands (Hawaii, New Zealand)]
Discussion

The records of subsp. mutilum from British Columbia and Saskatchewan and from California, Colorado, Oregon, and Utah (no details seen) are almost certainly all the result of introduction, as may be some other peripheral records.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 94.
Parent taxa Hypericaceae > Hypericum > sect. Brathys > Hypericum mutilum
Sibling taxa
H. mutilum subsp. latisepalum
Synonyms Brathys euphorbioides, B. quinquenervia, H. euphorbioides, H. mutilum var. densiflorum, H. mutilum var. foliosissimum, H. mutilum var. minimum, H. mutilum var. parviflorum, H. quinquenervium
Name authority unknown
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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