6. Viburnum ozarkense Ashe (Ozark arrowwood)
Map 1442
Plants shrubs 2–4
m tall. Bark firm, not peeling, usually relatively smooth to finely roughened
or warty, not fissured, gray or grayish brown to reddish brown. Winter buds
ovoid-conical, slightly flattened, with 2 pairs of overlapping scales,
glabrous, not or only slightly sticky. Stipules usually present but often shed
early, partially fused to the basal portion of the petiole, linear, glandular.
Petioles 5–22(–28) mm long, unwinged, with sparse to moderate minute, stalked
glands and usually also scattered, unbranched hairs, lacking prominent
glandular swellings near the tip. Leaf blades 7–18 cm long, 6–10(–14) cm wide,
unlobed, relatively thin and papery, broadly ovate to nearly circular, rounded
to truncate or shallowly cordate at the base, angled or short-tapered to a
bluntly or more commonly sharply pointed tip, the margins coarsely toothed with
the teeth 1–3 per cm, (10–)12–17 on each side, the surfaces moderately
pubescent with short, unbranched hairs, most abundantly along the main veins,
sometimes also sparsely and minutely glandular, often with 3–5 secondary veins
on each side crowded near the base of the midvein, pinnately veined above the
base, the secondary veins straight, often dichotomously branched but not
forming a network, extending to the leaf margin, each branch ending in a tooth.
Inflorescences short- to more commonly long-stalked, with 5–7 primary branches,
these with moderate to dense, minute glands at flowering, sometimes also with
scattered, unbranched hairs, the marginal flowers fertile and similar to the
other flowers. Ovaries with dense, minute glands. Fruits 8–12 mm long,
ellipsoid to oblong-ellipsoid and slightly flattened, bluish black, not
glaucous. Nutlet 7–10 mm long, yellowish brown to reddish brown. 2n=36.
May–June.
Uncommon, known
thus far only from Howell and Oregon Counties (Missouri, Arkansas, Oklahoma).
Ledges of dolomite bluffs and adjacent mesic upland forests.
This Ozark endemic
often has been listed as a synonym of V. molle, but it is actually more
similar to V. rafinesquianum. Weckman (2002), who resurrected the name
as a segregate of V. molle, presented a great deal of comparative
information on the morphology, range, and habitat of V. ozarkense.