3. Acalypha monococca (Engelm. ex A. Gray) Lill. W. Mill. & Ghandi (one-seeded mercury)
A. gracilens var. monococca Engelm. ex A. Gray
A. gracilens A. Gray ssp. monococca (Engelm.
ex A. Gray) G.L. Webster
Map 1651, Pl.
10–45 cm long, sparsely to densely pubescent with short, strongly
curved hairs. Leaves short-petiolate, the petiole 1/16–1/4 as long as
the blade, shorter than to occasionally about as long as the inflorescence
bracts. Leaf blades 1–7 cm long, linear to lanceolate, angled or
somewhat tapered at the base, angled or tapered to a usually sharply pointed
tip, the margins entire or with relatively few (mostly 3–5 on each
side) broadly spaced, blunt, minute teeth, sometimes appearing minutely
scalloped, relatively thin-textured to somewhat thicker and stiffer, the
surfaces sparsely to moderately pubescent with short, straight to curved,
loosely appressed hairs. Inflorescences entirely axillary spikes, 1–3
per node, each with 1(–3) basal pistillate node(s) (each with a
separate folded bract) below few to several nodes of staminate flower clusters,
the tip of the spike usually extending well beyond the bracts. Inflorescence
bracts 1 per pistillate node, 4–16 mm long, appearing more or less
folded longitudinally around the inflorescence, with (9–)10–17
mostly lanceolate to triangular-ovate lobes, the margins sparsely to moderately
bristly-hairy, at least some of the hairs usually gland-tipped, the outer
surface sparsely to densely hairy, usually at least some of the hairs
gland-tipped, also with sparse to moderate minute, reddish, sessile glands.
Fruits 1.8–2.6 mm long, 1-locular, 1-seeded, the surface moderately
hairy and occasionally also with sparse, minute, sessile glands, lacking
tubercles or slender projections at maturity. Seeds 1.6–2.4 mm long. 2n=40.
throughout Missouri but uncommon or absent from most of the northwestern
quarter of the state (Illinois to Iowa and Kansas south to Kentucky, Arkansas, and Texas). Glades, upland prairies, sand prairies, ledges and tops of bluffs,
savannas, and openings of mesic to dry upland forest; also pastures, railroads,
For a discussion
of the taxonomic problems involving this species and A. gracilens, see
the treatment of that species.