Flora of North America species comparison

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Hypericum mutilum subsp. mutilum

Hypericum mutilum subsp. latisepalum
Photo is of parent taxon

dwarf st john's wort, millepertuis nain, small Canadian St. John's-wort
Photo is of parent taxon
Stems

apical internode shorter than adjacent one or almost absent.

apical internode usually longer than adjacent one.
Leaf

blades variable, rarely broadly ovate or suborbiculate.

blades broadly ovate or broadly oblong-ovate to suborbiculate.
Inflorescences

branching from 2–10 nodes, mostly dichasial.

branching from 1–4(–6) nodes, branches diffuse and repeatedly monochasial distally.
Sepals

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

± imbricate, broader beyond middle.
2n

= 16.

Hypericum mutilum subsp. mutilum

Hypericum mutilum subsp. latisepalum
Phenology Flowering summer–fall (Jun–Oct). Flowering late spring–early summer (Apr–Jun).
Habitat Ditches, marshes, lake margins, desiccated temporary pools Ditches, marshes, lake margins, desiccated temporary pools
Elevation 0–400 m (0–1300 ft) 0–200 m (0–700 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)]
from FNA
FL; GA; NJ; SC; TX
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.)

Fernald recorded subsp. latisepalum from New Jersey; D. H. Webb (1980) did not record it north of South Carolina. No specimens have been seen from farther north than Georgia, where it appears to tend morphologically toward subsp. mutilum.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 6, p. 94. FNA vol. 6, p. 94.
Parent taxa Hypericaceae > Hypericum > sect. Brathys > Hypericum mutilum Hypericaceae > Hypericum > sect. Brathys > Hypericum mutilum
Sibling taxa
H. mutilum subsp. latisepalum
H. mutilum subsp. mutilum
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 H. mutilum var. latisepalum
Name authority unknown (Fernald) N. Robson: Bull. Brit. Mus. (Nat. Hist.), Bot. 20: 119. (1990)
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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