9 8 



FIELD COLUMBIAN MUSEUM BOTANY, VOL. III. 



stem and branches and alternate clasping, pale, linear-lanceolate or 

 spatulate, apiculate, subentire leaves. Heads solitary, 12-15 mm - 

 high, 2.5-3 cm. broad; ray flowers about 20, disk flowers numerous. 



Involucral bracts linear-lanceo- 

 late, coriaceous with green re- 

 volute-squarrose tips, strongly 

 resinous. Corolla of ray flowers 

 with short tube, ligule oblong- 

 elliptic, acute, entire, 8-10 mm. 

 long, spreading or somewhat 

 revolute; disk flowers fertile, 

 cylindrical, 5 cleft. Receptacle 

 slightly convex. Achene pale 

 brown, 1.3x3.7-4 mm., rhom- 

 boid-oblong narrowed at the 

 base, sublunate; in section com- 

 pressed lozenge-shaped, or in 

 .acheneof ray flowers 3 sided; 

 glabrous; awns 2-4 (mostly 3) 

 flattened, twisted, hispid-denti- 

 culate, 4-4.5 mm. long, caducous, the corollas more or less persistent. 

 Hab. Campo near Merida, 1887. Millspaugh jj. 

 The range of Grindelia nana Nutt. as given in Synoptical Flora 

 of N. Am. (i, part 2:119), is "Washington and east to N. W. Wyom- 

 ing, south to Shasta, California," and one collection of the species at 

 Santa Cruz, California, is considered "much out of range." The 

 above is the only specimen collected in Yucatan, this was probably 

 introduced with imported hay. Our specimen has leaves entire or 

 with a few teeth at the summit or base. 



ASTER L. Sp. PL, 872. 



Heads heterogamous, radiate; rays pistillate, fertile, ligulate;. 

 disk flowers perfect, fertile, tubular. Involucre campanulate, turbi- 

 nate, or hemispheric, of many herbaceous bracts, imbricated in several 

 series, the outer gradually shorter. Receptacle naked, plane or con- 

 vex. Achene laterally compressed, hard, nerved; pappus of slender 

 numerous bristles in i series. Herbs, heads corymbose or paniculate. 



Aster laevis L. Sp. PL, 876. 



An erect, smooth, perennial herb, branching above, with terete, 

 striate stem and alternate, ovate or oblong to lanceolate leaves, con- 

 tracted below into a winged petiole, upper with auriculate or sub- 

 cordate, partly clasping base. Inflorescence a cymose leafy panicle, 

 branches and pedicels angled, glabrate or nearly so. Heads 10 mm. 

 high, 20-22 mm. broad, ray flowers 15-25, disk flowers numerous. 

 Involucre turbinate, bracts in 3-4 series, rigid, erect, appressed, lan- 

 ceolate, acute, with dark green, ciliolate, mucronate tips. Ligules 

 pale violet, oblong, entire, 10-12 mm. long, spreading; disk corollas 

 brownish purple, 5 lobed. Receptacle slightly convex. Achene strami- 



