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Project Name Data (Last Modified On 6/6/2013)

Flora Data (Last Modified On 6/6/2013)
Species Conyza apurensist5 H.B.K.
PlaceOfPublication Nov. Gen. Sp. P1. 4: 73. 1820 [1818].
Note TYPE: Venezuela, Humboldt & Bonpland (P, not seen)
Synonym Erigeron spathulatum Vahl in West, Bidrag Ste. Croix 303. 1793. TYPE: St. Croix, West (C, not seen), not Conyza spathulata Hoenem. 1815.
Description Pubescent ephemeral herbs, mostly erect, often branched, to 1 m tall in lowland areas, smaller in uplands; stems pilose near the base with spreading whitish hairs.
Habit herbs
Description Lower leaves to 12 cm long, thin, spatulate; blade orbicular or elliptic, crenate toothed in the upper half, cuneate toward the base; petiole slender and narrowly winged, sparingly to densely pilose on both sides, the midvein prominent, the minor (pinnate) venation often obscure, upper leaves becoming smaller, entire, oblanceolate, sessile. Inflorescence an open panicle of many heads; pedicels to 20 mm long. Heads disciform, with many florets; involucral bracts imbricate, nearly equal, 3-4 mm long, the midvein flanked by stramineous, somewhat indurate tissue and a hyaline margin, sparingly pilose with long weak hairs; receptacle slightly convex, to 4 mm across, manifestly muricate and sometimes drying blackish; outer florets numerous in about 2 series, white, filiform with a distinct, minute, apically notched ligule to 1 mm long, rarely equalling or barely exceeding the pappus, the tube pubescent in the upper half, the style long-exserted, its branches short, linear-lanceolate, basally flattened; inner florets 3-5 mm long, the limb not much enlarged from the tube, apically 5-lobed, the anthers ca. 0.5 mm long, basally obtuse, apically with narrowly deltoid appendages, the style branches flattened, papillose-verrucose on the sides, glandular pilose on the short terminal appendages. Achene compressed, the margins somewhat thickened by two prominent veins, copiously pubescent; pappus of fine strigulose bristles in 1 series about as long as the inner florets.
Note This species is usually recognizable by the spathulate, crenate leaves near the base of the stem and by the numerous white florets. The large, muricate, often dark receptacle is also distinctive. The basal leaves are not scabrid as are those of C. chilensis. Lowland plants of C. apurensis are reminiscent of plants of Erigeron annuum, but that species has long, showy ligules and is not known to occur in lowland Panama.
Distribution ranges widely through tropical America.
Note According to Cuatrecasas ( 1969) it is a native of Asia. In Panama it occurs at all elevations, but plants of the lowlands are much larger and coarser than those of middle and higher elevations.
Specimen CANAL ZONE: Barro Colorado Island, Croat 5597, 8676 (both MO). Summit Garden, Croat 15009 (MO). Old road to Gamboa between Madden Wye and Summit Naval Radio Station, Croat 15022 (MO). Chagres, Fendler 162 (MO). Barro Colorado Island, Foster 970 (DUKE). Cerro Galera ca. 2 km from Pacific Ocean near W boundary of Canal Zone, Gentry 6655 (MO). Fort Amador causeway island, Tyson 5416 (MO). Macapale Island in Madden Lake, Tyson 5487 (MO). cHmiIQui: Quebrada Manzanillo, 91 km SSW of Puerto Armuelles, Busey 722 (MO). Near El Hato del Volcan, Croat 10710 (MO). Boquete Lookout, 4000 ft, D'Arcy & D'Arcy 6327 (MO). Hwy. N of Cerro Panda, 6000 ft, D'Arcy & D'Arcy 6619 (MO). Potrero, Boquete, 3800 ft, Davidson 664 (MO). Near Boquete, 3300-4200 ft, Lewis et al. 364 (MO). Near Boquete, 1200-1500 m, Woodson & Schery 775 (MO). Finca Lerida to Boquete, 1300-1700 m, Woodson et al. 1164 (MO). COCLE: La Mesa above El Valle, Croat 14302 (MO). Above El Valle de Anton, D'Arcy & D'Arcy 6737 (MO). Slopes of Cerro Pilon, 700-900 m, Duke 12089 (MO). DARIEN: Cana, 2000 ft, Williams 724 (NY). LOS SANTOS: Loma Prieta, 800-900 m, Duke 11873 (MO). PANAMA: Interamer. Hwy. near Tocumen Airport;--Croat 9768 (MO). Panama City on way to Tocumen, D'Arcy & D'Arcy 6115 (MO). Between Cerro Azul and Cerro Jefe, D'Arcy & D'Arcy 6228 (MO). Ca. 6 mi E of Chepo on Pan-Am. Hwy., Duke 4064 (MO). Rio Pacora just below Rio Corso, Duke 12030 (MO). Near Goofy Lake, Lazor 5540 (MO). W slope of Cerro Campana, 2300 ft, Tyson 4024 (MO). W slope of Cerro Campana, Tyson 4025 (MO).
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