PHILIPPINE URTICACEAE. 
13 
16. PIPTURUS Wedd. 
KEY TO THE PHILIPPINE SPECIES OF PIPTUKUS. 
Stipules free; glomerules axillary, rarely also spicate. 
Leaves long-petioled except on small branch lets or reduced plants, their 
margins entire or more often coarsely dentate 1. P. arborescens 
Leaves short-petioled, their margins regularly finely serrate 
2. P. mindanaensis 
Stipules united for about half their length, free at the apices; glomerules spicate, 
rarely also axillary. 
Both surfaces of leaf nearly same color; spikes usually solitary. 
Leaves elliptic or oblong to oval or'obovate, abruptly acuminate 
3. P. repandus 
Leaves narrowly elliptic or narrowly oblong, gradually acuminate 
4. P. succulentus 
Under surface of leaf white-tomentose. 
Spikes usually fascicled; leaves coriaceous, oval or narrowly oval; woody 
vine :. 5. P. discolor 
Spikes usually solitary; leaves thinner, ovate to lanceolate; tree 
6. P. argenteus 
1. Pipturus arborescens comb. nov. 
Urtica arborescens Link Enum. Hort. Berol. 2 (1822) 386; Blanco FI. Filip, 
ed. 2 (1845) 483; Naves in Blanco FI. Filip, ed. 3 (1877) pi. 311. 
Urtica baccifera Blanco FI. Filip. (1837) 695, non Linn. Sp. PI. ed. 2 (1763) 
1398. 
Pipturus asper Wedd. in Ann. Sci. Nat. Bot. IV 1 (1854) 197. 
Batanes Islands, Batan Island, For. Bur. 15295 Agudo. Babuyanes Islands, 
Camiguin Island, Bur. Sci. 3993 Fenix; Dalupiri,. Bur. Sci. 10101 McGregor. 
Luzon, Province of Ilocos Norte, Pasuquin, For. Bur. 13805, 13821 Merritt & 
Darling: Province of Ilocos Sur, Baranas River, For. Bur. 14082 Merritt & Dar- 
ling : District of Bontoc, For. Bur. 10914 Curran, Vanoverbergh '125, 189, 151: 
District of Lepanto, Balbalasan, For. Bur. 5691 Klemme: Province of Benguet, 
Mount Pulog, For. Bur. 18119, 18210 Curran, Merritt, & Zschokke; Sugpan, For. 
Bur. 14102 Merritt & Darling; Baguio, Williams 1013, Elmer 8489, 8146: Prov- 
ince of Union, Bauang, Elmer 5615 : Province of Pangasinan, Agno, Bur. Sci. 4839 
Ramos: Province of Bulaean, Norzagaray, Yoder 141: Province of Bataan , Whit- 
ford 12, For. Bur. 2222 Meyer, Williams 325: Province of Rizal, Bosoboso, Merr. 
Dec. Phil. For. FI. 214 Ahern’s collector; Antipolo, Merrill 1631,. Phil. PI. 366 
Ramos; Pateros, Bur. Sci. 9568 Robinson; Manila, Cuming 124, Ahern 112, Mer- 
rill 96, 98, Elmer 5509, Phil. Form. Sch. 44, 152, 488, 489 : Province of Laguna, 
Los Banos, Eallier s. n., Elmer s. n. : Province of Batangas, Lipa, Phil. Norm. 
Sch. 351: Province of Tayabas, Atimonan, Gregory 36; San Isidro, Fop. Bur. 
5689 Kobbe: Province of Camarines, Pasaeao, Ahern 154 ■ Mindoro, Merrill 
1221; Pola, Merrill 2241; Macaulig, For. Bur. 5362 Merritt; Aglubang River, For. 
Bur. 12023 Merritt; Bongabong River, For. Bur. 3123 Merritt. Negros, Himu- 
gaan River, Whitford 1635 ; Cadiz, Bur. Sci. 1343 Celestino; Talisay, For. Bur. 
15115 Tanosa; Luzuriaga, Bur. Sci. 9941 Robinson. Cebu, Toledo, Bur. Sci. 1183 
McGregor. Mindanao, Province of Surigao, Ahern 665 : Lake Lanao, Camp Keith- 
ley, Mrs. Clemens 240 : District of Zamboanga, Lunsugan, Ahern 619 : District of 
Cotabato, Bur. Sci. 11559 Robinson. Basilan, Isabela, Bur. Sci. 9982 Robinson. 
Palawan, Puerto Princesa, Bur. Sci. 246 Bermejo; Canina River, Bur. Sci. 169 
Foxworthy . 
Variable in the size, shape, and pubescence of the leaves. The Palawan col- 
