396 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Phyllaries linear-lanceolate or linear-spatulate from an 
ovate-lanceolate base; leaves ovate or oblong-ovate, 
1.1 to 1.8 em, wide......... 15. F. niederleinii. 
Leaves 5 to 13 cm. long, usually 2 to 5 cm. wide. 
Heads about 2.5 cm. wide; disk flowers 16 to 23. 
16. F. campestris. 
Heads 3.6 to 4 cm. wide; disk flowers 29 to 40. 
. 17. F. riparia. 
Phyllaries broad, ovate or oval. 
Outer or middle phyllaries with ovate base and abruptly 
narrowed tip..................0005 18. F. tortuosa. 
All the phyllaries broadly ovate to oblong, without abruptly 
narrowed tip..........-.-2- eee eee eee 19. F. oolepis. 
Leaves rhombic-ovate, deeply repand-dentate; petioles about 
one-third as long as blade............- 20. F. leptopoda. 
Leaves elliptic to ovate or oblong-elliptic, usually coarsely repand- 
dentate; involucre 1 to 2 cm. high, the phyllaries usually 
lance-spatulate....................00005 21. F. thurifera. 
Leaves narrowly lanceolate or oblong-lanceolate, usually denticulate, 
7 to 13 mm. wide................-..---- 22. F. angustifolia. 
Leaves oval or oblong-oval, 2 to 4 cm. wide, regularly denticulate. 
Phyllaries lanceolate to oblong-lanceolate, 7 to 8 mm. long. 
23. F. macrophylia. 
1. Flourensia laurifolia DC. Prodr. 5: 592. 1836. 
Helianthus laurifolius Benth. & Hook.; Hook. & Jacks. Ind. Kew. 17: 1112. 1893, 
as synonym. 
Shrub, 1.5 to 3 meters high, much branched, resinous-viscid, especially on the 
younger parts, and sparsely hispidulous or puberulous on the peduncles; leaf blades 
5.5 to 13 cm. long, 2 to 6 cm. wide, ovate to elliptic-ovate or obovate, acuminate or 
acute, rarely obtuse, mucronulate, cuneate at base, entire, resinous, shining, 
strigillose along costa above, otherwise glabrous, finely prominulous-reticulate on 
both sides (the larger lateral veins about 14 pairs); petioles sparsely strigillose, 
5 to 10 mm. long; heads in cymose panicles of 3 to 7 at ends of branches and 
branchlets, usually overtopped by the leaves; peduncles 1.5 to 2.8 cm. long, axillary, 
sometimes nodding in fruit; disk in flower turbinate-hemispheric, 1.5 cm. high, 
1 to 1.3 cm. wide, in fruit subglobose; involucre 3 to 4-seriate, graduated, 10 to 11 
mm. high, the outermost phyllaries linear-lanceolate or lance-ovate, obtuse to 
acutish, coriaceous-herbaceous, green, about 6 mm. long, ciliate toward tip, the 
others oblong-ovate to oblong-lanceolate, narrowed above the middle to an obtusish 
tip, resinous, glabrous or obscurely ciliolate, blackish green with paler margin, 
subcoriaceous, in old fruit spreading or reflexed; disk corollase ylindric-funnelform, 
6.8 mm. long (tube 2 mm.); pales scarious laterally, resinous at the obtusish tip, 
12 mm. long; achenes narrowly obovate, somewhat thickened, densely pilose, 7.5 
mm. long; awns 2, pilose, often 2 or 3-fid below, about 5 mm, long; squamellae none. 
TyPr LOCALITY: Between Victoria (‘‘ Vittoria’’) and Tula, Tamaulipas, Mexico. 
InLusTRATION: Deless. Icon. Sel. 4: pl. 35. 
SPECIMENS EXAMINED: 
TaMAULIPAS: Between Victoria and Tula, ‘“‘cerca las Minces,’’ November, 1830, 
Berlandier 2205 (type collection; B, G, K, Prod.). Mountains between 
Victoria and Tamaulipas, 1830, Berlandier 785 (G). Near Victoria, altitude 
320 meters, 1907, Palmer 32 (G, N). 
San Luis Potos{: Minas de San Rafael, 1911, Purpus 4789a (B, G, N). San 
Luis Potosi to Tampico, 1878-79, Palmer 1109 (G, K). 
Flourensia laurifolia is readily distinguished by its discoid heads and large, ovate 
to obovate leaves. 
