557. Calyptranthes thomasiana Berg, Myrtaceae, myr- 

 tle family. Flowers and fruits have not been described. 

 Shrub and small tree local on mountains at 300-800 ft 

 (91-244 m) altitude in St. Thomas and Vieques. Named 

 from St. Thomas in 1855 and found on Vieques by 

 Woodbury. 



304. Schoepfia arenaria Britton, Olacaceae, olax fam- 

 ily. Rare shrub, sometimes small tree, in moist coastal 

 and lower Cordillera forests at 100-1,500 ft (30-457 m) 

 altitude in northern foothills of Puerto Rico. Discovered 

 at San Jose Lagoon, Santurce, and afterwards found 

 near Quebradillas. Of limited distribution on privately 

 owned land and Rio Abajo Forest. 



265. Calyptronoma rivalis (O. F. Cook) L. H. Bailey, 

 palma manaca, Puerto Rican manac, Palmae, palm fam- 

 ily. The rarest of Puerto Rican palms, named in 1901, has 

 been known from only about 20 plants of all sizes grow- 

 ing along a marshy stream about 3 miles (4.8 km) east of 

 San Sebastian in northwestern Puerto Rico. The present 

 owner has expressed an intent to protect the remaining 

 trees. It is reported that a second grove nearby might 

 have been destroyed by clearing. Young plants are grow- 

 ing in the botanical garden of the University of Puerto 

 Rico at Lajas. Recently, Woodbury has discovered 

 another grove in Tanama River Gorge near Quebradillas. 



407. Zanthoxylum thomasianum (Krug & Urban) 

 Krug & Urban, Rutaceae, rue family. Rare shrub or small 

 tree in lower Cordillera forest at 500-1,500 ft (152-457 

 m) altitude on south slopes of Coamo-Cayey area in Cen- 

 tral Cordillera of Puerto Rico. Also mountain forests of 

 St. Thomas and St. John (Virgin Islands National Park). 



694. Goetzea elegans Wydler, matabuey, Solanaceae, 

 nightshade family. Small tree, very rare and local, known 

 only from a few places in the moist limestone and moist 

 coastal forests at 200-600 ft (61-183 m) altitude on north 

 coast of Puerto Rico. Collected near Aquadilla, Gua- 

 jataca Gorge near Quebradillas, Guajataca Forest, Cam- 

 balache Forest, and in 1883 at Jimenez near Rio Grande, 

 north of Luquillo Mountains. Worthy of cultivation as 

 an ornamental with showy orange flowers and orange 

 fruit. 



521. Daphnopsis hellerana Urban, Thymelaeaceae, 

 mezereon family. Shrub or small tree rare on or near 

 summits of limestone hills or mogotes at 80-500 ft (24- 

 152 m) altitude in moist limestone forest of northern 

 Puerto Rico. Collected west of Bayamon, south of 

 Dorado, and west to Guajataca Gorge near Quebradillas. 

 Discovered near Bayamon in 1900, named the next year, 

 and not collected again until rediscovered by Woodbury 

 in 1958 (77). 



3. Rare Endemic Species To Be Watched 



Several rare endemic tree species should be watched or 

 monitored because of their restricted occurrence, partly 

 on private land. At present they do not need additional 



protection, because representative areas of their habitat 

 are preserved, partly within public forests and parks. The 

 22 species listed below have been proposed as threatened 

 U). 



Cactaceae, Cactus Family 



538.1. Leptocereus quadricostatus (Bello) Britton & 

 Rose {Cereus quadricostatus Bello), sebucan. Rare cactus 

 sometimes forming a trunk to 1 ft (30 cm) in diameter, 

 mostly shrubby and vinelike. Endemic to southwestern 

 Puerto Rico and Icacos. Public forest — Guanica. 



Canellaceae, Canella Family 



522. Pleodendron macranthum (Baill.) v. Tiegh., 

 chupacallos. Small or medium-sized tree very rare in 

 forests in lower Luquillo Mountains and moist limestone 

 regions. Reported from Guajataca and near Arecibo. 

 Public forests — Luquillo, Rio Abajo. This distinctive 

 aromatic tree discovered in 1822-23 is one of the very 

 rarest in Puerto Rico. Foresters rediscovered it in 1938 

 and 1940 in a remote part of Luquillo Mountains and had 

 the drawing made. It doubtless persists in that undis- 

 turbed, poorly accessible locality, though there has been 

 no later search. 



Celastraceae, Bittersweet Family 



470. Maytenus cymosa Krug & Urban. Rare small tree 

 in coastal moist forests of lowlands below 100 ft (30 m) 

 altitude in eastern Puerto Rico (for example, near Fajar- 

 do) and islands eastward. Also Pineros, Vieques, St. 

 Croix, St. Thomas, and Virgin Gorda. Within Gorda 

 Peak National Park, Virgin Gorda (British Virgin 

 Islands). 



472. Maytenus elongata (Urban) Britton. Shrub or 

 small tree rare in moist limestone and lower Cordillera 

 forests at 500-2,500 ft (152-762 m) altitude, also Lu- 

 quillo Mountains (El Verde). Public forests — Guajataca, 

 Luquillo, Maricao, Susua. 



473. Maytenus ponceana Britton. Rare tree in moist 

 limestone and lower Cordillera forests at 500-2,000 ft 

 (152-610 m) altitude in foothills through Puerto Rico, for 

 example, near Arecibo and Lares. Public forests — Gua- 

 jataca, Maricao, Rio Abajo. 



Leguminosae, Legume Family 



368.1. Caesalpinia monensis Britton, mato negro. 

 Rare shrub or small tree to 20 ft (6.1 m) high and 5 in (13 

 cm) in trunk diameter. The only endemic tree species of 

 Mona Island. 



79. Stahlia monosperma (Tul.) Urban, cobana negra. 

 Small or medium-sized tree rare in coastal forests of 

 southwestern and southeastern Puerto Rico and in Vie- 

 ques. Public forest — Boqueron. Afterwards found near 

 Macao, eastern Dominican Republic, and thus techni- 

 cally not endemic. 



