Flora of North America species comparison

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Dichanthelium portoricense

blunt-glumed panicgrass
Habit Plants usually densely cespitose.
Culms

15-50 cm, slender, wiry;

internodes olive green to purplish, densely puberulent or glabrous;

fall phase spreading or decumbent, branching extensively from the lower and midculm nodes, producing numerous congested fascicles of reduced, flat or involute blades and reduced secondary panicles.
Cauline leaves

4-7;

sheaths much shorter than the internodes, densely crisp-puberulent, velvety-puberulent, or glabrous, often ciliate along the margins;

ligules shorter than 0.5 mm;

blades 2-7 cm long (seldom longer), 2.5-8 mm wide (rarely wider), spreading, firm, flat or slightly involute, without prominently raised veins, not longitudinally wrinkled, densely puberulent or glabrous abaxially, glabrous, sparsely puberulent, or pubescent adaxially, bases subcordate, with papillose-based cilia, margins often whitish and scabridulous.
Spikelets

1.5-2.6 mm, obovoid-pyriform, planoconvex in side view, puberulent, pubescent, or glabrous, attenuate basally, apices usually broadly rounded.
Basal

rosettes well-differentiated;

blades 1.5-6 cm, ovate to lanceolate.
Primary

panicles 2-7 cm long, 2/3 to nearly as wide as long, with relatively few spikelets, exserted;

branches flexuous, spreading or reflexed, scabridulous to densely puberulent.
Lower

glumes 0.6-1.4 mm, thin, weakly-veined, attached about 0.2 mm below the upper glumes, clasping at the base;

upper glumes as long as or slightly shorter than the lower lemmas;

upper florets 1.4-2 mm, broadly ellipsoid, apices subacute, minutely puberulent.
2n

= 18.

Dichanthelium portoricense
Distribution
from USDA
[WildflowerSearch map]
[BONAP county map]
Discussion

Dichanthelium portoricense grows in sandy woods, low pinelands, savannahs, and coastal sand dunes, usually in moist places. Its range extends south from the Flora region into Mexico, the Caribbean, and Mesoamerica. It is a highly variable species with numerous intergrading forms, some possibly resulting from hybridization with other widespread species in the same region, such as D. sphaerocarpon and D. commutatum.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Spikelets 1.8-2.6 mm long, usually densely pubescent or puberulent (rarely glabrous); cauline blades 4-7 cm long, 3.5-8 mm wide
subsp. patulum
1. Spikelets 1.5-2.0 mm long, puberulent to nearly glabrous; cauline blades 2-5 cm long, 2.5-4.5 mm wide
subsp. portoricense
Source FNA vol. 25, p. 441.
Parent taxa Poaceae > subfam. Panicoideae > tribe Paniceae > Dichanthelium > sect. Lancearia
Sibling taxa
D. aciculare, D. acuminatum, D. boreale, D. boscii, D. chamaelonche, D. clandestinum, D. commutatum, D. consanguineum, D. depauperatum, D. dichotomum, D. ensifolium, D. erectifolium, D. latifolium, D. laxiflorum, D. leibergii, D. linearifolium, D. malacophyllum, D. nodatum, D. nudicaule, D. oligosanthes, D. ovale, D. pedicellatum, D. perlongum, D. polyanthes, D. ravenelii, D. scabriusculum, D. scoparium, D. sphaerocarpon, D. strigosum, D. tenue, D. wilcoxianum, D. wrightianum, D. ×anthophysum
Subordinate taxa
D. portoricense subsp. patulum, D. portoricense subsp. portoricense
Synonyms Panicum portoricense
Name authority (Desv. ex Ham.) B.E Hansen & Wunderlin
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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