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(Last Modified On 3/20/2013)
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(Last Modified On 3/20/2013)
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Species
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Chamaesyce hyssopifolia (L.) Small,
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PlaceOfPublication
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Jour. N.Y. Bot. Gard. 3: 429, 1905.
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Synonym
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Euphorbia hyssopifolia L., Syst. Nat., ed 10, 1048, 1759. Euphorbia brasiliensis Lam., Encyc. Meth. Bot. 2: 423, 1788.
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Description
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Herb, annual or perennating; erect, ascending or decumbent, to 6 dm. Stem to 4 mm thick at somewhat woody base, glabrous or sparingly long pilose near base, straw-colored or darker brown. Leaves membranous; stipules joined or nearly free at upper nodes, almost obsolete to deltoid, 0.8 mm long, margin short-fringed; blades variable, glabrous or sparsely long pilose, linear-lanceolate, 15-35 X 3-6 mm, the base subcordate, the margin serrate only near the acute apex, to ovate- elliptic, somewhat falcate, 10-30 X 6-10 mm, the base rounded to subcordate, the margin serrate, the apex obtuse. Cyathia terminal and axillary in short-stalked diffuse or compact leafy dichasia, glabrous; glands transversely elliptic or sub- circular, the appendages obsolete to prominent, white or pink. Capsule glabrous, truncate-cuneiform to broadly ovoid, 1.5-2 mm long, 1.6-1.8 mm wide; seed oblong- ovoid, to 1 mm long, 0.5 mm wide, 4-angled, the faces flat with transverse ridges, brown or black, angles sometimes light.
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Habit
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Herb
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Distribution
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New World tropics and subtropics and an adventive weed in the Old World. A common weed throughout the Republic, particularly where man's activities have left disturbed ground. This taxon is very variable in other parts of its range but none of the extreme forms which may prove worthy of recognition seem to occur in Panama.
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Specimen
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BOCAS DEL TORO: Bocas del Toro I airport, Lewis et al. 785 (F, GH, MO, NY); vie of Almirante, Cooper 87 (F), 107 (F); Changuinola, Lewis et al. 818 (GH, K, MO, UC, US), Carleton 75 (NY); Changuinola valley, Dunlap 54 (F); Isla Colon, vie of Chiriqui Lagoon, von Wedel 2800 (MO, NY), 2954 (F, MO, NY); s. loc., von Wedel 141 (MO), 183 (MO). CANAL ZONE: Albrook Air Force Base, Tyson 1104 (MO); vie of Balboa, Seibert 381 (K, MO, NY); Balboa, Macbride & Featherstone 36 (F); Barro Colorado I, Aviles 21 (F), Bailey & Bailey 155 (F), 155a (F), Ebinger 34 (MO), Hood 1020 (F), Shattuck 483 (F), Woodworth & Vestal 409 (F); Chagres, Fendler 271 (MO), 276 (W), 277 (F, K, MO); Corozal to Pedro Miguel, Cowell 401 (NY); Culebra I, Duke 4631 (DAV, MO); ca 1 mi N of Fort Clayton, Stimson 5193 (DUKE, MO), 5197 (DUKE, MO); Fort Kobbe, Duke 3952 (MO); Fort Sherman, Burch et al. 1012 (K, MO, NY, UC); ca 6 mi N Gam- boa, Tyson 1509 (FSU); E of Gatun Locks, Duke 4301 (DAV); Gatun Sta, Hayes 675 (NY); Miraflores, Dwyer 1005 (MO), White 174 (MO); Santa Rita trail, Cowell 158 (NY). CHIRIQUI: vie of Boquete, Davidson 601 (F, MO), Dwyer & Hayden 7615 (MO); David airport, Lewis et al. 738 (GH, K, MO, NY, UC, US); Rio San Pedro, Dwyer & Hayden 7768 (MO). COCLE: betw Porto Posada & Penonome, Williams 165 (NY); Rio Hato airstrip, Blum & Dwyer 2481 (MO), Burch et al. 1155 (F, GH, MO, US). COLON: Maria Chiquita, E of Rio Piedras, Dwyer & Kirkbride 7795 (MO); vie of Rio Piedras, Blum et al. 2545 (MO). DARIEN: El Real, Burch et al. 1051 (GH, MO, UC, US); 0-4 mi up Rio Sabana from Santa Fe, Duke 4168 (MO). HERRERA: rd from La Avena to Pese, Burch et al. 1288 (K, MO, NY); ca 10 mi S of Ocu', Tyson et al. 2864 (MO). LOS SANToS: ca 3 mi S of Carreta, Burch et al. 1222 (K, MO, NY); 5-9 mi from Chitre on rd to Las Tablas, Burch et al. 1221 (MO, UC, US). PANAMA: nr Arraijan, Woodson et al. 1380 (F, MO, NY); NE of Hacienda La Joya, Dodge et al. 16905 (MO); Panama Viejo, Duke 5732 (MO); Panama City, Duke 4010 (MO); PanAmer Hwy 5-6 mi E of Chepo, Duke 4021 (DAV, MO); Rio Pacora nr confluence with Rio Corso, Duke 12002 (MO). PROVINCE UNKNOWN: S. loc., Seemann 196 (BM).
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