Flora of North America species comparison

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Hypericum mutilum subsp. latisepalum

Hypericum mutilum subsp. mutilum
Photo is of parent taxon
Photo is of parent taxon

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

apical internode usually longer than adjacent one.

apical internode shorter than adjacent one or almost absent.
Leaf

blades broadly ovate or broadly oblong-ovate to suborbiculate.

blades variable, rarely broadly ovate or suborbiculate.
Inflorescences

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

branching from 2–10 nodes, mostly dichasial.
Sepals

± imbricate, broader beyond middle.

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

= 16.

Hypericum mutilum subsp. latisepalum

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

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.)

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. FNA vol. 6, p. 94.
Parent taxa Hypericaceae > Hypericum > sect. Brathys > Hypericum mutilum Hypericaceae > Hypericum > sect. Brathys > Hypericum mutilum
Sibling taxa
H. mutilum subsp. mutilum
H. mutilum subsp. latisepalum
Synonyms H. mutilum var. latisepalum 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 (Fernald) N. Robson: Bull. Brit. Mus. (Nat. Hist.), Bot. 20: 119. (1990) 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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