STANDLEY TREES AND SHRUBS OF MEXICO 1401 



Numerous herbaceous species occur in Mexico. 

 Leaves linear or lance-linear 1. L. cavanillesiana. 



Xieaves ovate to oblong-lanceolate. 



Calyx and corolla pubescent 2. L. laxiflora. 



Calyx and corolla glabrous 3, L. nelsonii. 



1. Lobelia cavanillesiana Roem. & Schult. Syst. Veg. 5: 43. 1819. 



Lobelia persicaefolia Cav. Icon. PL 5: 12. pi. 518. 1799. Not L. persicaefoUa 

 Lam. 1789. 



Lobelia laxiflora angustifolia DC. Prodr. 7: 383. 1839. 



Lobelia nelsonii fragilis Robins. & Fern. Proc. Amer. Acad. 43: 27. 1907. 



Baja California to Durango, San Luis Potosi, Puebla, and Michoacdn. 



Plants herbaceous or suffrutescent; leaves short-petiolate, 7 to 15 cm. long, 

 3 to 12 mm. wide, long-attenuate, serrate, glabrous or nearly so; racemes very 

 leafy, the flowers on elongate pedicels, pubescent or glabrous; corolla 3 to 3.5 

 cm. long, red. 



2. Lobelia laxiflora H. B. K. Nov. Gen. & Sp. 3: 311. 1818. 

 Lobelia rigidula H. B. K. Nov. Gen. & Sp. 3: 311. 1818. 

 Lobelia lanceolata Hook. & Arn. Bot. Beechey Voy. 88. 1832. 

 Siphocampylus bicolor Don in Sweet, Brit. Fl. Gard. II. pi. 389. 1831-38. 

 Lobelia ovalifolia Hook. & x\rn. Bot. Beechey Voy. 301. 1839-40. 

 Lobelia angulato-dentata Hook. & Arn. Bot. Beechey Voy. 301. 1839-40. 

 Lobelia concolor Mart. & Gal. Bull. Acad. Brux. 11: 15. 1842. 



? Lobelia regalis Fernald, Proc. Amer. Acad. 36: 503. 1901. 



Sonora to Oaxaca and Veracruz; type collected between Cuajiniquilapa and 

 Acaguisotla, Guerrero. Central America. 



Plants herbaceous or suffrutescent, about 1 meter high; leaves sessile or short- 

 petiolate, 6 to 20 cm. long, 1 to 5 cm. wide, acute or acuminate, serrate, usually 

 densely pubescent beneath; racemes very leafy, the flowers borne on elongate 

 pedicels; corolla red, 3 to 4 cm. long. "Zarcilillo" (Jalisco); "diente de chucho," 

 "pastorcillo," "diente de perro" (El Salvador). 



3. Lobelia nelsonii Fernald, Proc. Amer. Acad. 36: 503. 1901. 

 Tj-pe from Huachinango, Jalisco. 



Shrub with hard wood; leaves short-petiolate, ovate to lanceolate, 4 to 7 cm. 

 long, 1 to 2.5 cm. wide, acuminate, serrate, sparsely hispidulous; flowers few, at 

 the ends of the branches; corolla red, 2.5 to 3 cm. long. 



157. ASTERACEAE. Aster Family. 



(Contributed by S. F. Blake; the genera Ophryosporus and Eupatorium by B. L. 

 Robinson, the genus Senecio by J. M. Greenman.i) 

 Herbs, shrubs, or trees, sometimes scandent; leaves opposite or alternate, 

 rarely whorled, entire to dissected, never truly compound; flowers collected in a 

 head (this rarely l-flowered) on a receptacle, surrounded by an involucre of 

 phyllaries (bracts) ; corolla gamopetalous, regular, tubular, and 5-toothed (rarely 

 2 to 4-toothed), bilabiate, or Hgulate (flattened, strap-shaped, and usually 2 to 

 5-toothed), rarely wanting in the pistillate flowers; stamens (in the hermaphrodite 

 or staminate flowers) almost always 5, united by the anthers or rarely free, insert- 

 ed on the corolla; ovary inferior, 1-celled, with an erect anatropous ovule; style 

 usually 2-branched, the branches stigmatiferous inside, often bearing sterile 

 appendages at apex; fruit an achene, with a single erect exalbuminous seed, often 

 bearing a pappus of bristles, awns, or scales. — The corollas are of 4 chief sorts, 



1 The vernacular names and economic notes have been contributed chiefly by 

 Paul C. Standley. 



