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Published In: Florula Ludoviciana, or, a flora of the state of . . . 64–65. 1817. (Fl. Ludov.) Name publication detail
 

Project Name Data (Last Modified On 8/11/2017)
Acceptance : Accepted
Project Data     (Last Modified On 8/10/2009)

 

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98. Arnoglossum Raf. (Indian plantain)

Plants perennial, the rootstock with somewhat fleshy roots. Stems erect or strongly ascending, usually unbranched below the inflorescence, sometimes lined, grooved, or angled, glabrous, sometimes glaucous. Leaves in a basal rosette and alternate, progressively reduced in size from the stem base to tip, glabrous (except sometimes along portions of the margins), sometimes glaucous. Basal and lowermost stem leaves long-petiolate, the blades simple, entire to palmately lobed, the margins otherwise entire or shallowly, irregularly, and bluntly toothed, the venation palmate or appearing more or less parallel, with 3–10 main veins. Inflorescences panicles, terminal and axillary from the uppermost leaves, usually flat-topped in profile. Heads discoid, short- to long-stalked, with 5 florets. Involucre 7–10 mm long, more or less cylindrical, the bracts in 1 or less commonly 2 series, glabrous, the inner series of 5 bracts, these rounded dorsally or sharply keeled, uniformly greenish white or green centrally with white margins; the outer series absent or of few minute bracts, these appressed, green or greenish white. Corollas white, cream-colored, or rarely somewhat pinkish-tinged. Style branches with a stigmatic band along each inner surface. Fruits 3.5–5.0 mm long, narrowly oblong to narrowly oblong-elliptic in outline, not flattened, 10-ribbed (12–15-ribbed in A. reniforme), glabrous, dark brown. Eight species, eastern U.S. and adjacent Canada.

 

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1 1. Leaf blades ovate to elliptic, the margins entire or shallowly toothed, not lobed, the main veins appearing more or less parallel (diverging from the base, converging toward the tip); involucral bracts with a sharp, winglike keel ... 2. A. PLANTAGINEUM

Arnoglossum plantagineum
2 1. Blades of at least the lower leaves broadly triangular-ovate to kidney-shaped or heart-shaped, the margins irregularly toothed and usually shallowly palmately lobed, the main veins palmate; involucral bracts rounded dorsally, not keeled

3 2. Stems glaucous, circular in cross-section, rounded or with fine longitudinal grooves; leaf blades glaucous on the undersurface ... 1. A. ATRIPLICIFOLIUM

Arnoglossum atriplicifolium
4 2. Stems not glaucous, angled in cross-section, with conspicuous longitudinal grooves; leaf blades not or only slightly glaucous on the undersurface ... 3. A. RENIFORME Arnoglossum reniforme
 
 
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