Part 7 - UNC Herbarium

POACEAE 870
14 Spikelets 0.9-1.4 mm long; vernal cauline blades 1.5-4 (-5) cm long and 1-5 mm wide; internodes or sheaths
glabrous or pubescent.
15 Spikelets 1.2-1.4 mm long; sheaths spreading-pilose; vernal cauline blades 2-5 mm wide; ligule 1-2 mm long;
node beard hairs usually spreading or reflexed; internodes glabrous ............................D. sp. 10 (=curtifolium)
15 Spikelets 0.9-1.2 mm long; sheaths glabrous; vernal cauline blades 1-2 (-3) mm wide; ligule < 1 mm long;
node beard hairs erect and often only partially encircling the node; internodes glabrous or puberulent .............
................................................................................................................................................D. chamaelonche
14 Spikelets 1.4-2.3 mm long; vernal cauline blades 5-12 cm long and 3-15 mm wide; internodes and sheaths
glabrous.
16 Spikelets 1.8-2.3 mm long; first glume 0.6-1.1 mm long; fertile lemma 0.8–1.0 mm wide; widest vernal
blades 3-8 (-10) mm wide ..............................................................................D. dichotomum var. dichotomum
16 Spikelets 1.4-1.9 mm long; first glume 0.3-0.6 (-0.7) mm long; fertile lemma 0.6-0.8 mm wide; widest vernal
blades 7-15 mm wide ...................................................................................... D. dichotomum var. ramulosum
13 Spikelets pubescent.
17 Spikelets 1.2-1.4 mm long; sheaths spreading-pilose; vernal cauline blades 1-4 cm long and 2-5 mm wide; ligule
1-2 mm long..........................................................................................................................D. sp. 10 (=curtifolium)
17 Spikelets 1.4-2.8 mm long; sheaths glabrous to appressed-pilose; vernal cauline blades 5-12 cm long and 5-15 mm
wide; ligule < 1 mm long.
18 Usually all culm nodes bearded; internodes glabrous, or middle and upper internodes and peduncle sparsely
to moderately spreading short-hairy, sometimes also glandular; upper as well as lower vernal sheaths and
both surfaces of cauline blades pubescent, often densely so; spikelets (1.5-) 1.8-2.1 mm long; [of dry rocky or
sandy basic soil and barrens]............................................................................................................D. annulum
18 Often only lower culm nodes bearded; internodes glabrous; at least middle and upper cauline blades glabrous;
spikelets 1.4-2.8 mm long; [mostly of wet acid soils and mesic to dry woodlands].
19 Spikelets (2.0-) 2.2-2.8 mm long; first glume 0.5-1.3 mm long; fertile lemma 1.8-2.3 mm long; lowest
vernal cauline blades pubescent at least abaxially.....................................................D. mattamuskeetense
19 Spikelets 1.4-2.2 mm long; first glume 0.3-0.9 mm long; fertile lemma 1.4-1.7 mm long; lowest vernal
cauline blades glabrous.
20 Spikelets 1.7-2.2 mm long; first glume 0.6-0.9 mm long; fertile lemma 0.7-1.0 mm wide.................
............................................................................................................... D. dichotomum var. nitidum
20 Spikelets 1.4-1.9 mm long; first glume 0.3-0.6 (-0.8) mm long; fertile lemma 0.6-0.8 mm wide .......
......................................................................................................... D. dichotomum var. ramulosum
Dichanthelium aciculare (Desvaux ex Poiret) Gould & Clark, Needle Witch Grass. Cp, Pd (GA, NC, SC, VA): sandy
woods and fields; common in Coastal Plain, uncommon in Piedmont. May-October. NJ south to n. Fl, west to TX and OK, also
in West Indies and n. South America. Blades typically are strongly involute. Can be confused with autumnal forms of D. ovale
var. addisonii, which has vernal blades 5-10 mm wide. See note at end of descriptions regarding Panicum chrysopsidifolium. [=
Panicum aciculare Desvaux ex Poiret – RAB, F, G; < P. aciculare – C; = D. aciculare ssp. aciculare – FNA; > P. aciculare –
HC, S; > P. bennettense M.V. Brown – HC, S; < D. aciculare – K, Z]
Dichanthelium acuminatum (Swartz) Gould & Clark. var. acuminatum, Woolly Witch Grass. Cp, Pd (GA, NC, SC, VA):
on dryish sandy or clayey soils of open woods and disturbed areas; common. May-October. MA south to FL, west to TX, also in
West Indies, Mexico, Central America, and n. South America. Internodes and sheaths gray-villous with usually non-papillate
hairs. Plants tend to be low and "bushy" with several spreading-ascending culms and dense autumnal branching. See note at end
of descriptions regarding Panicum chrysopsidifolium. [= Y; < Panicum lanuginosum Elliott – RAB; > P. lanuginosum var.
lanuginosum – C, F, G; < P. leucothrix Nash – C; > P. auburne Ashe – F, G, HC, S; < D. acuminatum ssp. acuminatum – FNA;
> P. lanuginosum – HC, S; >< D. acuminatum var. acuminatum – K, Z; >< D. acuminatum var. implicatum (Scribner) Gould &
Clark – K, Z; < P. acuminatum Swartz var. acuminatum – X]
Dichanthelium acuminatum (Swartz) Gould & Clark var. fasciculatum (Torrey) Freckmann, Slender-stemmed Witch
Grass. Mt, Pd, Cp (GA, NC, SC, VA): open or cut-over woods, thickets, fields, meadows, and shores, frequently on disturbed
soils; frequent (less common in the Coastal Plain). May-August. Newfoundland south to FL, west to CA, north to s. British
Columbia. Typically much less pilose than var. acuminatum, the hairs usually papillate. See note at end of descriptions
regarding Panicum glutinoscabrum. [= Y; < Panicum lanuginosum Elliott – RAB; > P. lanuginosum var. fasciculatum (Torrey)
Fernald – C, F, G; > P. lanuginosum var. tennesseense (Ashe) Gleason – C, G; > P. lanuginosum var. implicatum (Scribner)
Fernald – C, F, G; = D. acuminatum ssp. fasciculatum (Torrey) Freckmann & Lelong – FNA; > P. implicatum Scribner – HC; >
P. huachucae Ashe var. huachucae – HC, S; > P. huachucae var. fasciculatum (Torrey) Hubb. – HC; > P. tennesseense Ashe –
HC, S; > P. huachucae var. silvicola Hitchcock & Chase – S; >< D. acuminatum var. acuminatum – K, Z; >< D. acuminatum
var. implicatum (Scribner) Gould & Clark – K, Z; > P. acuminatum Swartz var. fasciculatum (Torrey) Lelong – X; > P.
acuminatum var. unciphyllum (Trinius) Lelong – X]
Dichanthelium acuminatum (Swartz) Gould & Clark var. lindheimeri (Nash) Gould & Clark, Lindheimer's Witch Grass.
Pd, Cp, Mt (GA, NC, SC, VA): open or cut-over woods, thickets, fields, meadows, and shores, often on wet soils; uncommon in
Piedmont, rare in Coastal Plain and Mountains. May-September. Nova Scotia west to Manitoba, south to FL and MO, west to s.
CA. Internodes as well as sheaths often nearly glabrous. Panicle axis sometimes sparsely pilose at branch nodes, but otherwise
glabrous. [= Y; < Panicum lanuginosum Elliott – RAB; >< P. lanuginosum var. lindheimeri (Nash) Fernald – C, G; > P.
lanuginosum var. septentrionale Fernald – C, F, G; > P. lanuginosum var. lindheimeri – F; = D. acuminatum ssp. lindheimeri