\ 
BLAKE—REVISION OF FLOURENSIA. 397 
2. Flourensia retinophylla Blake in Robinson, Proc. Amer. Acad. 49: 505. 1913. 
Much-branched resinous shrub, with brownish gray bark, the branchlets viscid; 
leaves mostly crowded toward the ends of the branchlets, their blades 2.5 to 3.5 cm. 
jong, 4 to 7.5 mm. broad, narrowly lanceolate, acute to subacuminate at both ends, 
mucronulate, entire, viscid, reticulate-venulose, with very indistinct primary veins; 
petioles very narrowly margined, 1 to 2 mm. long; heads in racemose corymbs of 2 
to 6 at tips of branchlets, exceeded by the leaves, on l-headed 1 to 3-bracteolate 
peduncles 0.4 to 1 cm. long; disk 12 to 15-flowered, turbinate, 10 to 13 mm. high; 
involucre triseriate, graduated, 8 mm. high, the phyllaries oblong-lanceolate to 
subovate-lanceolate, obtusish, yellowish green, lineate-striate, glutinous; pales firm, 
mucronate, obtuse, about 3-nerved, 8.5 to 10 mm. long; disk corollas glutinous, 5 to 
5.8 mm. long (the tube 1.1 to 1.5 mm.); achenes cuneate, slightly thickened, densely 
villous, 6 mm. long; awns 2, serrulate, somewhat ampliate at the base, 3 mm. long; 
squamellae none. 
Type LOCALITY: Sierra de la Paila, Coahuila, Mexico. 
SPECIMENS EXAMINED: 
Coanuma: Sierra de la Paila, November, 1910, Purpus 4728 (type collection; 
B, G, K, N). 
This species, the type collection of which was distributed as F. laurifolia, is easily 
distinguished from that and from the other discoid species by its narrowly lanceolate, 
very glutinous leaves. 
3. Flourensia cernua DC. Prodr. 5: 593. 1836. 
Helianthus cernuus Benth. & Hook.; Hook. & Jacks. Ind. Kew. 17: 1112. 1893, as 
synonym, 
Much-branched shrub, 1 to 2 meters high, erect or procumbent with erect branches, 
the bark gray, the heads and young branches resinous; branches strigillose; leaf blades 
1.7 to 2.5 em. long, 6.5 to 11.5 mm, wide, ovate to oval, acute at both ends, mucronu- 
late, entire, pale green, somewhat resinous, obscurely reticulate-veined, with one or 
two pairs of the lateral nerves sometimes conspicuous; petioles slightly strigillose, 
1 to 2.5 mm, long; heads nodding, solitary in the leaf axils, forming long leafy 
inflorescences; peduncles short, curved, with 1 to 3 ovate or elliptic bracteoles at 
apex; disk subturbinate, 12 to 20-flowered, 9 to 11 mm. high; involucre 2 or 3-seriate, 
subequal, 4.5 to 5 mm. high, the phyllaries oblong-lanceolate, acutish, resinous; disk 
corollas resinous-dotted, 3.5 mm. long (tube 1 mm.); pales rather thin, scarcely 
nerved, widened upwardly, then abruptly pointed, yellowish with a blackish keel 
above, 6 to 6.5 mm. long; achenes narrowly cuneate, thickened, villous, 6 mm. long, 
2 mm. wide; awns 2, ciliolate, unequal, 2.5 to 3.2 mm. long; squamellae none. 
Type Locauiry: Between Monterey and Lampasos, Nuevo Leén, Mexico. 
SPECIMENS EXAMINED: 
Texas: Big Springs, 1899, Bray 401 (N). El Paso, 1885, Gray (G). Prairies 
east of El Paso, 1849, Wright 355 (G, K). Valley of the Pecos, and hills 
between the Mimbres and the Rio Grande, 1851, Wright 1229 (B, G, K). 
Along the Pecos, 1850, Thurber 115 (G). Sierra Blanca, 1913, Rose & Fitch 
17933 (N). Presidio and foothills of Guadalupe Mountains, 1881, Havard 83 
(G, N). Valentine, 1904, Bailey 917 (N). Chenate region, 1889, Nealley 
533 (N). Without definite locality, Mexican Boundary Survey 563 (N); in 
1851, Wright 299 (G). 
New Mexico: Pecos Valley near Texas line, 1901, Bailey 722 (N). Tularosa, 
, 1904, Gaut 20 (N). San Andreas Mountains, 1902, Gaut 29 (N). Pena 
Blanca, Organ Mountains, 1906, Wooton & Standley (N). Mesa west of 
Organ Mountains, Dona Ana County, 1903 and 1904, Wooton (N). Lake 
Valley, 1914, Beals (N). Hachita, 1908, Goldman 1306 (N). Las Palomas, 
altitude 1,280 meters, 1909, Goldman 1792 (N). 
