Par? 1, 1922] AMBROSIACEAE 17 
3. Ambrosia cumanensis H. B. K. Nov. Gen. & Sp. 4: 276. 1820. 
Ambrosia maritima Sieber; Pres], Bot. Bemerk. 106, hyponym. 1844. Not A. maritima L. 1753. 
Ambrosia paniculata A. Rich. in Sagra, Hist. Cuba 11:51. 1850. Not A. paniculata Michx. 1803. 
Ambrosia artemisiifolia trinitensis Griseb. Fl. Brit. W. Ind. 370. 1861. 
Ambrosia paniculata cumanensis O. E. Schulz, Symb. Ant. 7: 86, 1911. 
A perennial, often suffruticose at the base, with a branched root; stem 5-20 dm. high, 
hirsute with long soft spreading or reflexed hairs; leaves bipinnatifid, strigose on both sides, 
paler beneath, long-hirsute on the veins; petioles 2-4 cm. long; leaf-blades triangular-ovate 
in outline; rachis winged, 2-4 mm. wide; divisions ovate-lanceolate, acute or mucronate; 
staminate heads numerous, in racemes terminating the branches; peduncles about 2 mm. long; 
involucre saucer-shaped or slightly broadly obconic, crenate on the margin, 3-4 mm. broad, 
sparingly hispidulous; sometimes with a few long scattered hairs; paleae of the receptacle fili- 
form; corolla puberulent; pistillate heads in small clusters in the upper axils; fruit obovoid, 
angled, puberulent and glandular-granuliferous; beak short, about 0.5 mm. long; spines 4-7, 
short, conic, rather stout. 
TYPE LOCALITY: Near Cumana, Venezuela. i 
DISTRIBUTION: Mexico to Colombia, Brazil, and the Lesser Antilles; Cuba. 
4. Ambrosia peruviana Willd. Sp. Pl. 4: 377. 1805. 
Ambrosia heterophylla Spreng. Syst. Veg. 3: 851, in part. -1826. Not A. heterophylla Muhl. 1805. 
Ambrosia artemisitfolia Benth.; Oerst. Vidensk. Meddel. 1852: 87. 1852. Not A. artemisiifolia 
iL eevee ° 
Ambrosia psilostachya Griseb. F1. Brit. W. Ind. 370, in part. 1861. 
Ambrosia paniculata peruviana O. E. Schulz, Symb. Ant. 7: 87. 1911. 
An annual or perennial herb, sometimes woody at the base, with branched root; stem 
3-20 dm. high, hirsute with mostly short hairs, but usually also with scattered longer ones; 
lower leaves bipinnatifid but the upper less dissected, hispidulous or strigulose above, paler 
and strigose beneath; petioles 1-3 cm. long; leaf-blades triangular-ovate in outline; rachis 
winged, 2-5 cm. wide; segments lanceolate or ovate-lanceolate, the terminal ones acute, the 
others often obtuse; staminate heads numerous, in terminal racemes; peduncles 1—-1.5 mm. 
long; involucre saucer-shaped, only slightly obconic, 3-4 mm. broad, hispidulous and glandu- 
lar-granuliferous; paleae of the receptacle filiform; corolla puberulent; pistillate heads in small 
clusters in the upper axils; fruit glandular-granuliferous and slightly hispidulous, somewhat 
rugose, ellipsoid; body 2-2.5 mm. long; beak stout, nearly 1 mm. long. 
TYPE LOCALITY: “Peru?” 
DISTRIBUTION: Cuba, Jamaica and Porto Rico; Mexico to Chili and Paraguay. 
5. Ambrosia monophylla (Walt.) Rydberg. 
Iva monophylla Walt. Fl. Carol. 232. 1788. 
Ambrosia paniculata Michx. Fl. Bor. Am. 2: 183. 1803. 
Ambrosia artemisiifolia elatior Desc. Fl. Ant. 1: 239. 1821. 
Ambrosia artemisiifolia 6 T. & G. Fl. N. Am. 2: 291. 1842. 
Ambrosia artemisiifolia jamaicensis Griseb. Fl. Brit. W. Ind. 370. 1861. 
Ambrosia artemisiifolia paniculata Blankinship, Rep. Mo. Bot. Gard. 18: 173. 1907. 
An annual herb, with branched tap-root; stem 3-12 dm. high, hirsutulous and with scat- 
tered long hairs, obtusely angled, somewhat glandular-granuliferous, branched; lower leaves 
opposite, the upper alternate; petioles 2-3 cm. long, more or less hiruste; blades bipinnatifid 
to near the midrib, or the upper pinnate or entire, scabrous-puberulent above, strigose beneath; 
segments lanceolate, acute, more or less lobed or toothed; staminate heads numerous, in 
elongate racemes; peduncles 1-1.5 mm. long; involucre oblique, broadly obconic, 3 mm. broad, 
hispidulous, crenate on the margins; paleae of the receptacle filiform; pistillate heads in small 
clusters in the upper axils; body of the fruit fully 2 mm. long, broadly obovate, angled and 
rugose, glandular-granuliferous; spines 5-7, short, conic; beak 0.5 mm. long or less. 
TYPE LoOcALITy: Carolina. 
DIstTRIBUTION: North Carolina to Mississippi, Texas, and Florida; Bahamas; Cuba; Jamaica; 
Santo Domingo (?). 
ILLUSTRATION: Desc. Fl. Ant. 1: pl. 55. 
