218 
ROBINSON. 
minutely 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- 
filaments 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 - 2.5 mm long, narrowly oblong, 5-angled, sparingly scabrid; 
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 glabreseent ; 
leaves opposite, borne on petioles 4.5-12 mm long, the lamina lanceolate 
or ovate, 2. 6-6. 6 cm long, 8-20 mm wide, the base rounded or acute, 
the margins coarsely serrate with 4-13 glandular teeth on each side, 
the apex resembling one of the teeth though much longer, not acuminate, 
when dry dark-green on the upper and pale-green on the lower surface, 
densely glandular on both surfaces, on the upper surface moderately 
pubescent on the veins, elsewhere subscabrid or glabreseent, the lower 
surface densely pubescent on the veins, elsewhere silvery-lejudote ; primary 
lateral veins on each side of the midrib 3-6. 
Type collected on Mount Santo Tomas (Tonglon), Province of Benguet, Luzon, 
by R. S. Williams, no. 1976, November 30, 1904; also represented by the following 
collections from the same province: Mount Santo Tomas, Williams 11/35; Pauai 
to Baguio, Merrill 1/699; Suyoc to Pauai, Merrill 1/723. 
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 Thunb. FI. Jap. (1784) 301. 
Gliondrilla dentata Poir. Suppl. 2 (1811) 328. 
Youngia dentata DC. Prodr. 7 (1838) 193. 
Ixeris Thunbergii A. Gray Mem. Am. Acad. II. 6 (1859) 397. 
Lactuca Thunbergii Maxim. Bull. Acad. Petersb. 19 (1874) 530. 
Lactuca Thunbergiana ITemsl. Jour. Linn. Soc. Bot. 23 (1888) 484. 
Lactuca lusonica Vidal Rev. PI. Vase. Filip. (1880) 165. 
Batanes Islands, Batan Island, Santo Domingo de Basco, Bur. Sci. 361/5 Fenix. 
Luzon, Province of Nueva Viseaya, Bagabag, Merrill 150: Province of Benguet, 
Baguio, For. Bur. 1/91/7 Curran, Elmer 81/01/, Bur. Sci. 2512 M earns ; Mount 
Tonglon, For. Bur. 11099 Whit ford; Twin Peaks, Elmer 6387; without more 
definite locality, Loher 3632, Bur. Soil 2766, 2803, 2808, 2861/, 31/63 Mearns: 
Province of Zambales, Iba, Bur. Sci. 1/7S7 Ramos; Mount Pinatubo, Bur. Sci. 2568 
Foxworthy : Province of Pampanga, Mount Abu, Bur. Sci. 201/0 Fox-worthy : Prov- 
ince of Albay, Mount Mayon, Bur. Sci. 2926 Mearns. Mindoro, Alag River, 
Merrill 611/3. Negros, Canlaon Volcano, C. S. Banks, without number. Min- 
danao, District of Davao, Todaya, Williams 2536, Copeland, without number; 
Sibulan River, Copeland 1312. 
Distribution, Japan, China, and Formosa. 
