Buchnera americana
Buchnera obliqua
American bluehearts, bupleurum
Arizona bluehearts
simple or branched distally, 3–9 dm, spreading-hirsute proximally, appressed-hirsute or glabrous distally.
simple or branched distal to middle, 2–6 dm, spreading- or ascending-hispid, hairs pustular-based.
much smaller distally;
larger blade: major veins 3, minor veins (0–)2, narrowly ovate to lanceolate, 25–65 x 5–18 mm, margins irregularly dentate, teeth 2–3 mm, apex acute, surfaces short-hispid.
not smaller distally;
blade obscurely 3-nerved, linear to linear-lanceolate, 20–50 x 2–6 mm, margins entire or irregularly dentate, teeth 0.5–2 mm, apex acute, surfaces short-hispid.
bracts ovate-lanceolate, 4–6 mm.
bracts ovate-lanceolate, 5–9 mm.
1–1.5 mm;
bracteoles 2–3 mm.
0–1 mm;
bracteoles 5–9 mm.
calyx 6–8 mm, tube obscurely 10-nerved, ascending- to appressed-hispid, hairs often pustular-based;
corolla 15–21 mm, glabrate externally, lobes 5–8 mm;
style included, 1–2 mm.
calyx 7–9 mm, tube prominently 10-nerved, ascending-hispid, hairs pustular-based;
corolla 10–15 mm, hairy externally, lobes 3–5 mm;
style included, 2–3 mm.
blackish, ovoid, 6–8 mm, glabrate.
blackish, ovoid, 4.5–6 mm, glabrous.
0.6–0.8 mm.
0.6–0.8 mm.
= 40.
Buchnera americana
Buchnera obliqua
Buchnera americana has declined significantly in the past century and now is of conservation concern in most states east of the Mississippi River and in Ontario; its current stronghold is in Kansas, Missouri, and Oklahoma. In greenhouse studies, B. americana and B. floridana parasitized a variety of grass and tree species (Celtis, Fraxinus, Liquidambar, Liriodendron, Nyssa, Paspalum, Pinus, Quercus); natural hosts remain largely undocumented (L. J. Musselman and W. F. Mann 1977, 1978). It is nearly restricted to older geological regions away from the coastal plain, primarily in circumneutral to high pH soils; there are records from eastern Texas-central Louisiana, southeastern Louisiana-southern Mississippi, and a few records from northwestern Florida, all apparently in acidic soils. There appears to be no morphological intergradation with B. floridana in those areas, and the occurrence of B. americana there is puzzling.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Buchnera obliqua was first collected in the flora area in the Huachuca Mountains in August 1882; it was next collected in 1993, also from the Huachuca Mountains.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
IL Wildflowers
KS Wildflowers
LA Plants
MD Biodiversity
MI Flora
MO Plants
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