(Last Modified On 6/3/2013)
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(Last Modified On 6/3/2013)
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Species
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Centratherum punctatum Cass.
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PlaceOfPublication
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Dict. Sci. Nat. 7: 384. 1817.
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Synonym
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Apherephis aristata H.B.K., Nov. Gen. Sp. P1. 4: 32, tab. 314. 1818. Baccharoides punctatum Kuntze, Rev. Gen. P1. 320. 1891.
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Description
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Herbs or low subshrubs to 5 dm tall, upright, sometimes from runners, single- stemmed or many-branched, lignescent; branches terete, ascending, often striate, villous to tomentose. Leaves lanceolate to ovate to obovate, acute at the apex, cuneate at the base, marginally entire to pauciserrate (4-6 pairs of teeth), 1.5-5(-6) cm long, 0.5-4 cm broad, glandular punctate and villosulous on both surfaces, lateral veins ascending, 3-6 pairs, inconspicuous. Inflorescences sessile, solitary, terminating the branches. Heads discoid with many florets; involucre broadly hemispherical, the outer involucral bracts 6-15, foliaceous, curved and spreading, the inner involucral bracts scariose, 4-6-seriate, narrowly deltoid, apically acute to obtuse, spinescent, the awns 1-4 mm long, awns and involucral bracts ciliolate; receptacle flat, alveolate, naked; corolla tube narrowly cylindric, expanding slightly at the apex, purple, 5-7 mm long, 5-lobed, the lobes linear to lanceolate, 1-2 mm long; stamens 5, the anthers 1-1.5 mm long, apically acute, obtusely sagittate at base; styles 6-7 mm long, bilobed, the lobes puberulous, 1-2 mm long, acute. Achenes narrowly turbinate, weakly ribbed, 1-2 mm long, ultimately epappose; pappus of deciduous filiform scales 1-2 mm long, antrorsely puberulent.
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Habit
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Herbs or low subshrubs
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Note
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Locally common in rocky or gravelly savanna-like areas, this species can be found near sea level but occurs more frequently from 600-1200 m altitude. This species appears to be very close to Centratherum intermedium of Brazil. In fact, the distinction between the two species is less than satisfactory.
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Specimen
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CANAL ZONE: Ancon Hill, Greenman & Greeninan 5120 (MO). CHIRIQUI: Between Boquete and David, Ebinger 743 (MO). Boquete, Llanos Francia, 4 mi from Boquete toward Dolega, Dwyer & Hayden 7582 (GH, MO). Llanos Francia, Dwyer & Lallathin 8710 (MO). Frances Arriba School, ca. 14 mi N of David, Lewis et al. 653 (GH, MO, NY, US). 5 mi S of Boquete, McDaniel 6799 (MO); Allen 4690 (MO). 8 km N of David, Partch 69-145 (MO). Boquete, Stern et al. 1218 (MO). Vic. of Boquete, Woodson & Schery 790 (MO). COCLE1: S of El Valle, Allen 2857 (MO). Rio Hato airstrip, Burch et al. 1137 (GH, MO, NY, US); Tyson & Blum 2557 (MO). Between Las Margaritas and El Valle, Woodson et al. 1262, 1772 (both MO, NY). HERRERA: 10 mi S of Ocui, Tyson et al. 2873 (MO). PANAMA: Hills near Campana, Allen 1307 (MO, NY). Vic. of Pacora, Allen 1115 (MO). Camino de Burunga, Nuevo Emperador, Austin 23 (MO). Road between Goofy Lake in Cerro Azul and main hwy., Correa & Dressler 431 (MO). Savanna near Rio Pacora and Chepo Hwy., Duke 5905 (MO). Road toward top of Cerro Campana, Duke 5917 (MO). Road from Pan-Am Hwy. to Coronado Beach, Duke 11794 (MO). Cerro Campana, Ebinger 923 (MO). Rio Tocumen, Hunter & Allen 242 (MO, NY). SE slope of Cerro Campana, Lewis et al. 3122 (MO, NY). Nuevo Emperador, Peralta 27 (MO). Sabana de Tortuga, Pittier 3339 (NY). Penonome and vic., Williams 90 (NY). Near Arraijan, Woodson et al. 1397 (MO, NY).
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