Anthurium lorresianum Engl., Bot. Jahrb. Syst. 25: 428. 1898. leg toTYPE: Costa Rica. San José: San Francisco de Guadalupe, 1,100 m, Tonduz 7176 (US, hololectolype; F, M, NY, isolectotype; designated Croat & Baker, 1979).

Epiphyte or terrestrial; stems to 60 cm or longer; internodes 1-2 cm long; leaf scars obscured by cataphylls; roots few, green, 3-8 mm diam.; cataphylls coriaceous, 7-15 cm long, drying reddish brown, persisting intact.

LEAVES with petiole erect-spreading, 20-90 cm long, 4-8 mm diam., terete or weakly sulcate; geniculum 2-3.5 cm long; blades ovate, moderately thick, 14-55 cm long, 9-38 cm wide, acuminate at apex, deeply lobed at base; anterior lobes 11-44 cm long, posterior lobes 4-12 cm long; sinus parabolic to spathulate; the upper surface semiglossy, the lower surface glossy; the midrib convexly raised above, acutely raised below; primary lateral veins 4-5 per side, weakly sunken above, raised below; basal veins 4-7 pairs, 3-4 coalesced 1-4 cm (rarely free to base); posterior rib naked, weakly turned upward; collective vein arising from first basal vein, sunken above, acutely raised below, 3-10 mm from margin.

INFLORESCENCE erect to slightly arching; peduncle 16-50 cm long, 1-4 mm diam., terete; spathe, pale yellow-green, subcoriaceous, oblong-ovate to lanceolate, 6-13 cm long, 1.7-3 cm wide, inserted at 70° angle on peduncle; spadix stipitate 6-10 mm in front, 1-3 mm in back, pale green becoming white or cream colored, 4.5-8.5 cm long, ca. 8 mm diam. at middle, ca. 7 mm diam. at base and apex; flowers 4-lobed, 2.3-2.8 mm long, 2.6-3 mm wide, the sides straight to sigmoid, 5-8 flowers visible in ihe principal spiral; 8-13 flowers visible per alternate spiral; tepals glossy, obscurely punctate, lateral tepals 1.4 mm wide, the inner margin ± straight; pistils weakly and acutely raised, white, minutely papillate; stigma linear, 0.3 mm long, a minute inconspicuous slit with minute droplets briefly apparent ca. 1 week before stamens emerge; stamens emerging rapidly, scattered throughout spadix, the lateral stamens first; anthers white, held in ± contiguous square at edge of pistil, 0.4-0.7 mm long; thecae ovoid, weakly divaricate; pollen white.

INFRUCTESCENCE arching-pendent; spadix to 15 cm long, to 2 cm diam.; berries red, ovoid, ca. 8 mm long, ca. 5 mm wide; pericarp with elongate raphide cells; mesocarp clear, gelatinous; seeds 2, brown, ca. 4 mm long, ca. 2 mm wide. Figs. 84 and 88.
 

Anthurium hoffmannii is found in Costa Rica and Panama at elevations mostly between 700 and 1,700 m, principally in tropical wet, premontane rain and lower montane rain forest but also in premontane wet forest.This species is in section Calomystrium and is closely related to (and perhaps not separate from) A. huixtlense, which ranges from Mexico (Chiapas) to northern Nicaragua, and to A. monteverdense from Costa Rica. It is also related to a number of unnamed taxa from Panama. All these species share a similar thick, ovate, prominently basally lobed blade, and thick, persistent cataphylls that dry reddish-brown and remain intact in age. Leaves generally have numerous short, linear, raphide cells on the upper surface which can be seen both before and after drying.

 
 Map of Mesoamerican specimens with coordinates

Costa Rica Alajuela: 850 m, 10.18N 84.44W, 2 November 1989, Erick Bello 1426 (MO).
Costa Rica Guanacaste: 1540 m, 10.21N 84.48W, 20 August 1988, William Haber & Willow Zuchowski 8618 (MO).
Costa Rica Lim—n: 850 m, 9.47.50N 83.05.30W, 5 April 1989, Gerardo Herrera Pastor Sanabria & Manuel Solís 2512 (MO).
Costa Rica Lim—n: P.N. Cordillera de Talamanca; Cordillera de Talamanca, 1300 m, 09.24.15N 83.05.15W, 7 March 1992, Gerardo Herrera 5215 (CR, INB).
Costa Rica Lim—n: 400 m, 09.54N 083.12W, 20 Feb. 1995, Rodriguez, A. 551 (INB, MO).
Costa Rica Puntarenas: 100-300 m, 08.41N 83.33W, 8 Oct 1984, Michael Grayum 4109 (MO).
Costa Rica Puntarenas: 1200 m, 8.49N 82.58W, 6-7 March 1984, Thomas B. Croat 57273 (MO).
Costa Rica Puntarenas: 40 m, 8.41N 83.31W, 2 March 1985, T.B. Croat & M.H. Grayum 59740 (MO).
Costa Rica Puntarenas: 1200 m, 08.54.40N 82.47.10W, 25 September 1990, Marvin Ramírez en el curso II de Parataxónomos 214 (MO).
Costa Rica Puntarenas: 1500 m, 10.18N 84.48W, 13 June 1987, William Haber & Erick Bello 7501 (MO).
Costa Rica Puntarenas: R.F. Golfo Dulce; Península de Osa, 400 m, 08.38.45N 83.35.25W, 21 July 1990, Gerardo Herrera 3994 (CR, MO).
Costa Rica Puntarenas: R.I. Ujarrás; Cordillera de Talamanca, 1500 m, 09.17.50N 83.15.30W, 10 March 1993, Gerardo Herrera 5844 (CR).
Costa Rica Puntarenas: Wilson Botanical Garden, 1250 m,, 4 July 1994, Kress & Prinzie 94-4567 (MO).
Costa Rica Puntarenas: P.I. La Amistad, 1250-1300 m, 09.01.35N 83.00.45W, 9 Apr 1996, Villalobos 298 (CR, INB, MO).
Costa Rica San José: 1200-1300 m, 09.26.30N 83.43.00W, 19 August 1990, Michael Grayum, Helen Kennedy & Noriaki Murakami 9946 (MO).
Costa Rica San José: 1750 m, 09.28.40N 83.41.25W, 27 November 1990, Barry Hammel 17976 (MO).
Costa Rica San José: 730 m,, , Skutch 3076 (GH, MO).
Costa Rica San José: Fila Bustamante, 900-1000 m, 09.42.57N 84.17.02W, 24 June 1995, J.F. Morales 4469 (CR).
Costa Rica San José: 1100-1200 m, 09.33.30N 84.03.15W, 5 September 1996, Thomas B. Croat 78899 (INB, MO, WU).
Costa Rica San José: 1500 m, 09.27.32N 83.42.40W, 9 September 1996, Thomas B. Croat & Dylan Hannon 79097 (INB, MO).
Costa Rica San José: 990-1100 m, 09.18.24N 83.46.11W, 9 September 1996, Thomas B. Croat & Dylan Hannon 79109 (INB, MO).
Costa Rica San José: 1000 m, 09.18N 083.46W, 21 Feb. 1977, W. Burger & G. Visconti 106 (MO).
Panama Bocas del Toro: 590 m, 8.46N 82.14W, 10 March 1985, T.B. Croat & M.H. Grayum 60201 (MO).
Panama Bocas del Toro: 1000 m, 8.45N 82.15W, 8 Dec 1985, Gordon McPherson 7861 (MO).
Panama Bocas del Toro: Fortuna Dam Area, 1000 m, 8.48N 82.12W, 5 Feb 1984, Churchill et. al 4643 (PAN).
Panama Bocas del Toro: 1000 m, 8.48N 82.12W, 5 Feb. 1984, H.W. Churchill, G. de Nevers & H. Stockwell 4643 (MO).
Panama Chiriquí: 1400 m, 8.47N 82.40W, 23 August 1982, Clem Hamilton, H. Stockwell & A. Aiello 916 (MO).
Panama Chiriquí: 1200-1400 m, 8.50N 82.43W, 17 March 1983, C. Hamilton & H. Stockwell 3484 (MO).
Panama Chiriquí: 1600 m, 8.49N 82.38W, 15 June 1987, Thomas B. Croat 66203 (MO).
Panama Chiriquí: 800 m, 08.53N 82.35W, 28 March 1993, Thomas B. Croat 74887 (MO).
Panama Chiriquí: 1575 m, 08.31N 81.46W, 30 March 1993, Thomas B. Croat 75017 (MO).
Panama Chiriquí:, 8 December 1997, D.W. Roubik & L. Quroz 1307 .
Panama CoclŽ: 89.39N 80.36W, 23 June 1988, Thomas B. Croat 68783 (MO).
Panama CoclŽ: 89.39N 80.36W, 23 June 1988, Thomas B. Croat 68846 (MO).