ROBINSON AND GREENMAN. — TRIXIS. 13 
= = = = Leaves smoothish, finely reticulate-veiny beneath. 
15. T. frutescens, P. Br. Shrub, much branched, 1 to 1.5 m. 
“ high; branchlets glabrous or sparingly appressed-pubescent: leaves nar- 
rowly lanceolate to lance-ovate, 3 to 10 em. long, 1 to 3.5 cm. broad, 
more or less acuminate and mucronate, subentire to distinctly dentate, 
sessile or narrowed into a subpetiolate base, glabrous or nearly so on 
both surfaces: inflorescence a many-headed somewhat leafy corymbose 
panicle; heads 1.5 to2 cm. high, usually about 12-flowered ; inner invo- 
lucral scales 8 (or rarely 10) in number, 10 to 12 mm. long, the outer 
linear or lance-linear, usually half to two-thirds as long as the inner, 
rarely quite as long. — P. Br. ace. to Spreng. Syst. iii. 501 (1826); DC. 
Prodr. vii. pt. 1, 68; Hemsl. 1. c. 258; Less. Linnaea, v. 33; Benth. Pl. 
Hartw. 88; Klatt, Bull. Soc. Bot. Belg. xxxv. pt. 1, 293. 7. radiale, 
Lag. acc. Hook. f. & Jacks. Ind. Kew. ii. 1131, but Lagasca seems 
never to have employed the combination, although he referred the Lin- 
naean species to Zrixis, as had P. Browne many years before (Hist. 
Jam. 312). TZ. laevigata, Lag. ace. to Spreng. Syst. iii. 501 (1826).° 
T. divaricata, Klatt, Bull. Soc. Bot. Belg. xxxi. pt. 1, 215 (1892) not 
Spreng. Perdicium radiale, L. Sp. ed. 2, 1248 (1763); Lag. Amen. Nat. 
i. 36; Lam. Ill. t. 677, f. 2. P. laevigatum, Berg. Act. Holm. 228, 6.4 
(1772); Lam. Dict. v. 179, & Ill. t. 677, f. 1. Jnula Trizis, L. Amoen. 
Acad. v. 406 (1760). Tenorea Berteri, Colla, Hort. Ripul. 137 (1824). 
T. calyculata, Bert. ace. to Colla, 1. c. Prenanthes fruticosa, Willd. acc. 
to Less. Linnaea, v. 33 (1830) & DC. Prodr. vii. pt. 1, 69. —Tamau- 
Lipas: near Matamoras, Berlandier, nos. 690, 2100 (both in hb. Gr.), and 
near Victoria, Berlandier, nos. 810, 2230 (both in hb. Gr.) ; near Jimenez, 
Nelson, no. 6660 (hb. Gr., hb. U. S. Nat. Mus). The last five num- 
bers represent a form with the outer accessory involucral bracts equal- 
ling the inner proper involucre. San Luis Poros: alt. 1850 to 
2500 m., Parry & Palmer, no. 550 (hb. Gr.) ; limestone hills, Las Pal- 
mas, alt. 120 to 160 m., Pringle, nos. 5766, 8005 (both in hb. Gr.). 
Teric: Santiago and Tepic, Lamb, no. 552. Vera Cruz: Valley of 
Cordova, Bourgeau, no. 2035 (hb. Gr.); Mirador, Sartorius (hb. Gr.) ; 
near the city of Vera Cruz, Pringle, no. 5771 (hb. Gr.), Linden, no. 
1208 (hb. Gr.). Oaxaca: between San Carlos and San Bartolo, alt. 
1000 to 1500 m., Nelson, no. 2567 (hb. Gr.) ; on wooded slopes of the 
Tehuantepec below Tolopan, growing under trees, C. & H. Seler, no. 
1702 (hb. Gr.). Cutapas: between Tonala and Tuxtla in mountain 
woods near Cuesta San Fernando, C. § Z. Seler, no. 1932 (hb. Gr.) : 
