218 ROIUXSON. 
niimitely antrorsely barbed; corolla tubular, white to pale purple, 3.5-4 
mm long, its 5 lobes equal, ovate, obtuse at the apex, 0.5 mm long; 
filanients about 0.8 mm long, anthers also 0.8 mm long, at the apex 
with an ovate obtuse or rarely acute transparent appendix 0.3 mm long; 
achenes 2-2 Ji mm long, narrowly oblong, .'T-angled, sparingly seabrid; 
style attaining a length of nearly 5 mm, cleft into two arms for about 
half this distance. 
Herbaceous, 1-1.5 mm high, the stem striate, the youngest shoots 
densely ferruginous-pubescent, the older smoother, at length glabrescent; 
leaves opposite, borne on petioles 4.5-1? mm long, the lamina laneeohilr 
or ovnte, 2.(\-C^.Cy em long, 8-20 mm wide, the base rounded or acute, 
the margins coarsely serrate with 4-13 ghmdular teeth on each side, 
the apex resembling one of the teeth though jnuch longer, not acuminate, 
when dry dark-groen on the upper atid pale-green on the lower surface, 
densely glandubir on both surfaces, on the upper surface moderately 
pubescent on the veins, elsewhere subscabrid or glabrescent, the lower 
surface fhmsely pubescent on the veins, elsewhere silvery-lepidote; primary 
lateral veins on each side of the midrib 3-6. 
Tj'pe collected on Mount Santo Tomas (Tonglon), rrovhice of Benguet, Luzon, 
l)y R. S. Williams, no. linU, Noveml>er 30, 1904; also represented by the foUowuit? 
collections from the same province: Mount Santo Tomas, WilUamfi 7.',S5; Pauai 
to Baguio, Merrill 4GiW ; Suyoc to Pauai, Merrill i725. 
Distinguished from Eupatorium sambucifolium Elmer by its more numerous, 
broader involucral scales, smaller, more coarsely serrate and less acuminate leaves, 
and other characters. 
LACTUCA Linn. 
Lactuca dentata (Thunb.) comb. nov. 
Prenanthes dentata Tliunb. Fl. Jap. (1784) 301. 
ChondrUln ilrntnfa Poir. Suppl. 2 (1811) 328. 
Youngia dentata DC. Prodr. 7 (1838) 103. 
Ixeris Thunhergii A. Gray Mem. Am. Acad. 11. 6 (1850) 307. 
Lactuca Thtinbergii Maxim. Bull. Acn<l. Petersb. 19 (1874) 530. 
Lifctuca Thutibcrijiann Tlemsl. Jour. Linn. Soc. Pot. 23 (1888) 484. 
Lactuca Vuzonica Vidal Rev. PI. Vase. Filip. (1886) 105. 
Bataxes Islands, Hatan Island, Santo Domingo de Basco, Bur, Sci 36'i'> Fenix. 
LrzON, Province of Xueva Viscaya, Bnjrnbng, Merrill ir>0: Province of Benguet, 
Baguio, For. Bur, //.9)7" Curran, Elwcr 8',0), Bur. ^ci, 2512 Mearns; Mount 
Tonglon, For. Bur. IWDO Whitford; Twin Peaks, Elmer 6387; without more 
definite locality, Loher 3632, Bur. xSci. 21166, .m3, 280.% 286.;, 3.'i63 Mearm: 
Province of Zambales, Iba, Bur. Sci. 4787 Banios; Mount Pinatubo, Bur. Set. 2o6S 
Foxicorihij: Province of Pampanga, Mount Abu, Bur. Hci. 2O.',0 Foxtcorthy : Prov- 
ince of Albay, Mount ilayon. Bur. Sci, 2926 Mearns. Mixdoro, Ahig River, 
Merrill 61^f3. Negros, Canlaon Volcano, G. S. Banks, without number. Min- 
danao, District of Davao, Todaya, WilUamfi 2536, Coprland, without number; 
Sibulan River, Coprland 1312. 
Di-stribution, Japan, China, and Formosa. 
