PHILIPPINE DIPTEROCARPACEAE. 273 Mocanera guiso Blanco Fl. Filip. ed. 1 (1837) 449. Dipterocarpus guiso Blanco Fl. Filip. ed. 2 (1845) 313. Anisoptera guiso A. DC. Prodr. 16^2 (1868) 616. S. vidaliana Brandis 1. c. 83. Leaves chartaceous, ovate-lanceolate, acute or acuminate, base rounded or cuneate, glabrous or nearly so. Secondary nerves 15 to 18 pairs. Leaf-blade 7 to 15 cm long, 2 to 6 cm wide; petiole 1 to 3 cm long. Flowers described by Blanco as having 30 stamens. Fruit with three wings which are 2.5 to 3 cm long and 4 to 8 mm wide ; the two short wings 15 to 20 mm long, 2 to 4 mm wide, linear or spatulate; fruit 4 to 6 mm in diameter and about 6 to 8 mm high, slightly stouter than the fruit of S. polysperma. This species most closely resembles S. polysperma, from which it differs in its grayish bark, harder and grayer wood, usually thinner leaves which taper toward the base and are not inrolled at the margins, and the shorter and stouter fruit. The species is sufficiently variable to make any one set of characters of only comparative value and it is often extremely difficult to distinguish these two species from sterile material. LUZON, Province of Cagayan, For. Bur. 14730 Darling, For. Bur. 16960, 17255 Curran: Province of Isabela, For. Bur. 14842 Darling: Province of Ilocos Norte, For. Bur. 13851, 14012 Merritt & Darling: Subprovince of Bontoc, For. Bur. 17015 Curran: Province of Abra, For. Bur. 14653 Darling: Province of Nueva Vizcaya, For. Bur. 10877 Curran, For. Bur. 18025 Merritt: Province of Nueva Ecija, For. Bur. 8439, 8466 Curran, For. Bur. 14307 Saroca: Province of Pangasinan, For. Bur. 8397 Curran & Merrit, For. Bur. 13471, 13514 Medina, For. Bur. 14354, 14379 Villamil: Province of Tarlac, For. Bur. 15395 Zschokke: Province of Pampanga, For. Bur. 17692, 17735 Curran: Province of Zambales, For. Bur. 5811, 5995, 6912 Curran, For. Bur. 6081 Aguilar, For. Bur. 19470, 19475 Agama: Province of Bataan, Merrill 1482 Garcia, For. Bur. 490, 491, 508, 530, 543, 545, 550, 553, 572, 576, 581 Barnes, Dec. Phil. For. Fl. 71 Barnes, Jan. 1904, in flower, For. Bur. 659 Borden, April 1904, in flower, For. Bur. 1179, 1398, 1525, 1530, 1533, 1559, 1572 Borden, For. Bur. 1799 Borden, Sept. 1904, in fruit, Bur. Sci. 1605, 1614, 1642 Foxworthy, For. Bur. 5276, 5954, 6374, 17522 Curran, For. Bur. 7344 Curran, June 1907, in fruit, For. Bur. 13542 Alvarez: Province of Bulacan, Bur. Sci. 12267 Foxworthy: Province of Rizal, Vidal 984, For. Bur. 440, 1167, 2865 Ahern’s coll., April-June 1904-5 in flower, For. Bur. 3088 Ahern’s coll., Bur. Sci. 20 Foxworthy, Bur. Sci. 1460 Ramos, For. Bur. 10038 Curran: Province of La Laguna, For. Bur. 19125 Tamesis, For. Bur. 22290 Mariano: Province of Batangas, For. Bur. 7687 Curran & Merritt: Province of Tayabas, For. Bur. 6056 Kobber, For. Bur. 10174, 10269, 10320, 10375, 10393, 10400 Curran, For. Bur. 18660 Darling, Bur. Sci. 13116 Foxworthy & Ramos: Province of Camarines, Ahern 129 Garcia, For. Bur. 4537 Barredo, For. Bur. 10461, 10670, 10704 Curran: Province of Albay, For. Bur. 15003 Aldor: Province of Sorsogon, For. Bur. 10629 Curran. MARINDUQUE, For. Bur. 12159 Rosenbluth. TICAO, For. Bur. 12552 Rosenbluth. MASBATE, Whitford 1694, For. Bur. 12565 Rosenbluth, For. Bur. 21002 Darling. MINDORO, For. Bur. 5387, 8673, 8778, 8783, 9712, 9766, 11387, 12025 Merritt. SAMAR, For. Bur. 12873, 12849 Rosenbluth. LEYTE, For. Bur. 12799 Rosenbluth. NEGROS, Province of Negros