GNAPHALIUM

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Generic segregations have reduced Gnaphalium from hundreds of species to ca. 38. North American species (north of Mexico) not included here have been segregated to Euchiton, Gamochaeta, Omalotheca, and Pseudognaphalium. Species of Gnaphalium in the strict sense (adopted here) are usually ca. 3–30 cm, loosely tomentose and not glandular, and have loosely glomerulate heads, involucres 2–3(–4) mm diam., white-tipped inner phyllaries, papillate cypselae, and readily falling pappi of distinct bristles, features especially contrasting with Pseudognaphalium, to which most North American species have been transferred. Because of their relatively small stature and tendency to produce loosely spiciform arrays of heads, gnaphaliums sometimes are identified as gamochaetas, which have different cypselar vestitures and different pappi. The lectotype species of Gnaphalium is G. uliginosum Linnaeus; discussion of this choice rather than Pseudognaphalium (Gnaphalium) luteoalbum (Linnaeus) Hilliard & Burtt is given in C. Jeffrey (1979), O. M. Hilliard and B. L. Burtt (1981), and J. McNeill et al. (1987).

Facts about "GNAPHALIUM"
base shapecuneate +
blade shapeoblanceolate +, spatulate + and linear +
branch orientationdecumbent-ascending +
bristle architecturebarbellate +
bristle fusiondistinct +
chromosome count7 +
cluster architecture or shapecapitate +
corolla colorationpurplish + and whitish +
cypsela shapeoblong +
face colorationtaxonname-concolor + and gray +
face external texturetomentose + and glabrous +
face reliefpapillate +
floret architecturepistillate +
floret countnumerous than bisexual +
floret positionperipheral + and inner +
floret reproductionbisexual +
glomerule architecturespiciform +
hair shapepapilliform +
head architecture or shapedisciform +
involucre shapecampanulate +
leaf architecturesessile +
leaf arrangementalternate +
leaf positioncauline +
margin shapeentire +
pappus behaviourfalling +
phyllary colorationwhite +, tawny +, brown +, opaque + and hyaline +
phyllary positionprotruding + and outer +
phyllary reflectanceshiny +
phyllary shapeoblong + and white-tipped +
receptacle architectureepaleate +
receptacle architecture or external texture or reliefsmooth +
receptacle prominence or shapeflat +
series count1 +
stem architecture or exudationglandular +
stem count1 +
stem external texturewoolly-tomentose +
stem orientationerect +
stereome architecture or exudationglandular +
tip external texture or internal texturechartaceous +
tip sizeunequal +
whole organism architecturetaprooted + and fibrous-rooted +
whole organism life styleannual +, biennial + and perennial +