STANDLEY TREES AND SHEUBS OF MEXICO 1603 



91. LAPHAMIA A. Gray, PI. Wright. 1: 99. 1852. 



Reference: Rydberg, N. Amer. Fl. 34: 24-27. 1914. 

 1. Laphamia dissecta Torr.; A. Gray, PI. Wright. 2: 81. 1853. 



Laphamia lemmoni pedata A. Gray, Proc. Amer. Acad. 16: 101. 1880. 



PerUyle dissecta A. Gray, Syn. Fl. 1^: 320. 1884. 



Leptopharynx dissecta Rydb. N. Amer. Fl. 34: 24. 1914. 



Niggerhead Mountains, along Arizona-Sonora boundary line. Te.xas and 

 Arizona; type from Presidio del Norte, Texas. 



Suffruticulose from a thick woody caudex, many-stemmed, about 15 cm. 

 high, densely spreading-villous and glandular-puberulent, very leafy; leaf blades 

 suborbicular-ovate in outline, 5 to 10 mm. long, about equaling the petioles, 

 pedately trisect with lobed and toothed divisions; heads discoid, solitary, whitish, 

 about 7 mm. wide; achenes linear-oblong, densely hispidulous, not distinctly 

 ciliate, marginate all around (including apex) ; pappus awn 1, shorter than achene, 

 or wanting; squamellae none. 



Several other species of Laphamia occur near the Mexican boundary, and will 

 doubtless be found in Mexico. 



92. FLAVERIA [Juss.] J. F. Gmel. Syst. Nat. 2: 1269. 1791. 



References: J. R. Johnston, A revision of the genus Flaveria, Proc. Amer. 

 Acad. 39: 279-292. 1903; Rydb. N. Amer. Fl. 34: 142-146. 1915. 



Herbaceous or suffrutescent, usually glabrous; leaves opposite, sessile, narrow; 

 heads yellow, small, in close cymose panicles or glomerules; involucre 1-seriate, 

 of 1 to 8 phyllaries, sometimes with a few bractlets at base; ray 1 or wanting; 

 achenes oblong, 10-ribbed; pappus (in ours) none. 



Phyllaries 3 or 4; ligule 5 mm. long 1, F. vaginata. 



Phyllaries 5; ligule 2 mm. long 2. F. linearis. 



1. Flaveria vaginata Robins. & Greenm. Proc. Amer. Acad. 32: 48. 1896. 

 Known only from the tj'pe locality, betweeti Coixlahuaca and Tamazulapan, 



Oaxaca. 



Suffrutescent (?), many-stemmed from a thick woody root, about 20 cm. 

 high, prostrate to ascending; internodes very short, pubescent in lines; leaves 

 linear-lanceolate, 2 to 3 cm. long, attenuate, entire; heads 6 to 8-flowered, closely 

 aggregated; ray achene 2.2 mm., disk achenes 1.8 mm. long. 



2. Flaveria linearis Lag. Gen. & Sp. Nov. 33. 1816. 

 Flaveria maritima H. B. K. Nov. Gen. & Sp. 4: 285. 1820. 

 Selloa nudata Nutt. Amer. Journ. Sci. I. 5: 300. 1822. 

 Flaveria tenuifolia Nutt. JoUrn. Acad. Phila. 7: 81. 1834. 

 Gymnosperma nudatum DC. Prodr. 5: 312. 1836. 



Yucatdn. Florida, Bahamas, and Cuba; type from Havana, Cuba. 



Suffrutescent, glabrous, up to 80 cm. high, prostrate to erect; lower internodes 

 short, the leaf bases persistent; leaves linear, 2 to 10 cm. long, 1 to 4 mm. wide, 

 fleshy, entire; heads 2 to 7-fiowered, crowded in small, ternately divided, cymose 

 panicles, short-pediceled or sessile, about 5 mm. high; achenes equal, about 

 1.6 mm. long. 



93. EUTETRAS A. Gray, Proc. Amer. Acad. 15: 39. 1879. 



Reference: Rydberg, N. Amer. Fl. 34: 30. 1914. 

 1. Eutetras palmeri A. Gray, Proc. Amer. Acad. 15: 40. 1879. 



Eutetras pringlei Greenm. Proc. Amer. Acad. 41: 266. 1905. 



Zacatecas to San Luis Potosi and Hidalgo; type from Angostura, San Luis 

 Potosi. 



