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

Flora Data (Last Modified On 6/6/2013)
Species Baccharis trinervis Pers.
PlaceOfPublication Syn. P1. 2: 423. 1807.
Description Weak tree or shrub, often somewhat scandent, to 4 m tall; branches arising at right angles, drying green with many longitudinal striations or angles, puberulent
Habit tree or shrub
Description with appressed arachnoid hairs, mostly not resinous. Leaves to 8 cm long, entire, elliptic, basally obtuse or acute, apically acuminate and sometimes mucronate, beneath with three prominent, elevated, parallel veins and finely reticulate, above with more or less obscure venation, puberulent to pilose on both sides, more so above, coriaceous; petioles to 15 mm long. Inflorescence paniculate, situated within or overtopping the foliage; peduncles stout, pubescent, to 20 cm long; bracts 20-25 mm long, leaflike, pilose; pedicels mostly less than 8 mm long, drying strongly angled with minute bracteoles on the lower half. Pistillate heads discoid, hemispherical or globose; involucral bracts imbricate in about 3 unequal series, the innermost acuminate, the remainder obtuse or rounded, apically erose, indurate, stramineous except for the short broad midvein visible in the upper portion; receptacle 1-2 mm across, conical, conspicuously muricate, with elongate, deciduous paleas 2-4 mm long; florets ca. 5 mm long, the corolla white, capillary, inflated near the base, apically erose, sparingly pubescent, the style long-exserted, its branches linear, flattened. Staminate heads discoid, smaller than the pistillate heads; involucral bracts dorsally puberulent; receptacle conical, naked, muricate, florets 4 mm long, the limb constituting more than half the corolla length, the tube divided nearly to the base into 5 lanceolate, apically acuminate, marginally thickened, glabrous lobes, the anthers ca. 1.3 mm long, fully exserted, basally auricled, the appendages narrow, the style pubescent upwards, its branches lanceolate, flattened, copiously glandular pubescent on the dorsal surface, the ovary (sterile) reduced to an inconspicuous disc between carpopodium and pappus. Achene densely pubescent; carpopodium prominent; pappus of fine strigulose bristles in 1 series, strigose and slightly larger near the apex, tawny or greenish colored.
Note This species is distinct in its puberulent vegetative parts, and in its elongate, deciduous paleas. The conical receptacle differs from the flat receptacle of the other Panamanian species. Pistillate and staminate plants differ not only in the sex of their flowers; the staminate plants also have narrower, less pubescent leaves and more pubescent involucral bracts. Cuatrecasas (1969) recognized two varieties under B. trinervis. Variety trinervis has broader leaves and is less pubescent than var. rhexioides (JH.B.K.) Baker. Both varieties may be identified in Panamanian material.
Distribution ranges from Mexico to Peru and northern Argentina but does not extend east to Venezuela. In Panama it is a frequent plant from lower to upper elevations in all provinces, occurring wherever natural or man-made disturbance has taken place.
Common Santa Maria
Specimen CANAL ZONE: Victoria fill near Miraflores Locks, Allen 1744 (MO, NY). Barro Colorado Island, Croat 4206 (MO, NY), 6457, 7221 (both MO). 1 mi N of Summit Gardens, Croat 8885 (MO). Ca. 1 mi N of Gamboa Gate on Pipeline Road, D'Arcy 5217 (MO). Pipeline Road within 5 mi of Gamboa Gate, D'Arcy & D'Arcy 6015 (MO). Fort Sherman, Duke 4350 (MO). Barro Colorado Island, Ebinger 38 (MO). Chagres, Fendler 156 (MO), 161 (MO, US). Gamboa, Heriberto 54bis (US). Chagres River 1 mi N of Gamboa, Lazor 3500 (MO). Between Corozal and, Ancon, Pittier 2646 (NY). Ancon Hill, Pittier 3 March 1906 (US). Barro Colorado Island, Shattuck 583 (MO). Balboa, Standley 27002 (US). Near Summit, Standley 29589 (US). Between France Field and Catival, Standley 30288 (US). Between Matias Hernandez and Juan Diaz, Standley 32041 (US). Barro Colorado Island, Starry 264 (MO). Miraflores Locks area, Tyson 1254 (MO). 10 mi N of Gamboa, Tyson 6313 (MO). Barro Colorado Island, Woodworth & Vestal 437 (MO). CHIR1QUI: Trail from Paso Ancho to Monte Lirio, upper Rio Chiriqui Viejo, 1500-2000 m, Allen 1472 (MO, NY). 1 mi SW of Boquete, 4000 ft, Allen 4720 (MO). Palo Santo, 3 mi N of Volcan, Croat 13551 (MO). Roadside from Paso Canoas to Cafias Gordas, Croat 22212 (MO). Ca. 17 mi from David on road to Boquete, D'Arcy & D'Arcy 6305 (MO). Bajo Chorro, Boquete District, 6000 ft, Davidson 366 (MO, US). Rio Chiriqui Viejo, N of Volcan, Duke 8995 (MO). Tole, Dwyer & Hayden 7767 (MO). Llanos Francia, Dwyer 8715 (MO). Near Boquete, 3,300-4200 ft, Lewis et al. 620 (MO). Pastures around Boquete, Pittier 2872 (NY). Llanos Francia, 3300 ft, Stern et al. 1222 (MO). Llanos just S of Boquete, Stern et al. 1953 (MO, US). Finca Lerida to Boquete, 1300-1700 m, Woodson et al. 1113 (MO, NY). COCLE: Hills S of El Valle de Anton, 600-800 m, Allen 2864 (MO, US). Near Sardinilla, ca. 7 mi E of cement plant, Blum & Tyson 496 (MO). Ca. 1 mi E of Santa Clara Beach, D'Arcy 4087 (MO, NY). Santa Clara Beach, Croat 9591 (MO). Road to La Mesa 2 mi above El Valle, Croat 13299 (MO). Hills above El Valle de Anton, D'Arcy & D'Arcy 6767 (MO). Cerro Pilon near El Valle, Duke 12074 (MO) . El Valle, Dwyer 1937 (MO). Above El Valle, Gentry 5624 (MO). Near Salamania, 8 mi E of Transisthmian Hwy., ca. 100 m, Gentry 6705 (MO). El Valle de Anton, 1000-2000 ft, Lewis et al. 2518 (MO). Santa Rita Ridge, Lewis et al. 5266 (MO). 5 mi N of El Valle, 2500 ft, Tyson et al. 2438 (US). Near Penonome, Williams 206 (NY). DARIEN: Isla Boca Grande, Duke 8839n (MO). HERRERA: Between Ocui & Chitre, D'Arcy 4144 (MO). Between Las Minas & Pese, 600 ft, Duke 12336 (MO). S of Ocu' 12.5 mi, 1200 ft, Lewis et al. 1666 (MO, US). LOS SANTOS: Loma Prieta, 8,00-900 m, Duke 11903 (MO). Pocri, Dwyer 1119 (NY). 17.8 mi S of Macaracas, 1100 ft, Lewis et al. 1594 (MO, US). Loma Prieta, Cerro Grande, 2400-2800 ft, Lewis et al. 2230 (MO). Isla de Coiba, Mendez 137 (MO). Between Tonosi and Macaracas, Oliver et al. 3573 (MO). 12 mi S of Macaracas, Tyson et al. 2931 (MO). PANAMA: Cerro Jefe, 2700 ft, Blum & Duke 2186 (MO). 10 km N of El Llano on road to Carti, Busey 915 (MO). Finca del Indio, Cerro Jefe, D'Arcy 5232 (MO). Panamai Viejo, Duke 5727 (MO). Near top of Cerro Campana, Duke 5989 (MO). Cerro Jefe, Duke 9422 (MO). Cerro Campana, Duke 10723 (MO). Coronado Beach, Duke 11799 (MO). Rio Pacora below Rio Corso, Duke 12024 (MO). Cerro Campana, Ebinger 361 (MO, US). Camino de las Sabanas, Heriberto 282 (US). Cerro Campana, Lazor 2217 (MO). Near Panamai, Macbride 2615 (US). Bellevista, Panama City, Macbride 2740 (MO, US). Cerro Campana, 2600 ft, McDaniel 6921a (MO). Between Matias Hernandez & Juan Diaz, Standley 32041 (US). Just S of La Capitano, Tyson 6763 (MO). VERAGUAS: Hills W of Sona, 500' m, Allen 1025 (MO, US). Ca. 29 mi W of Santiago, King 5280, 5277 (both US). Isla de Coiba, Mendez 137 (MO).
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