ParT 1, 1922] AMBROSIACEAE 7 
ous, in leafy panicles; involucre hemispheric, about 4 mm. broad; bracts 3-5, distinct, orbicular 
or obovate, rounded at the apex, pubescent, somewhat imbricate, slightly membranous-mar- 
gined; outer paleae oblong-cuneate, the inner ones linear-spatulate, obtuse; staminate flowers 
6-15; corolla funnelform, glabrous; anthers with acute tips; style shorter than the stamens; 
stigma subcapitate; pistillate flowers 3-5; achenes broadly obovate, 2 mm. long, glandular- 
muricate. 
TYPE LOCALITY: Near Havana, Cuba. 
DISTRIBUTION: Banks and coastal plains, Cuba and the Bahamas. 
10. Iva axillaris Pursh, Fl. Am. Sept. 743. 1814. 
Iva foliolosa Nutt. Trans. Am. Phil. Soc. II. 7: 346. 1840. 
Iva axillaris pubescens A. Gray, in Torr. Bot. U. S. can 17: Exp. 350. 1874. 
Iva axillaris normalis Kuntze, Rev. Gen. 348. 189 
Iva axillaris brevifolia Kuntze, Rev. Gen. 348. isot. 
Iva axillaris linearifolia Kuntze, Rev. Gen. 348. 1891. 
A perennial, with a creeping rootstock, woody only at the base; stems ascending, 3-6 dm. 
high, striate, strigose or hirsute; branches simple, erect; lower leaves opposite, those of the in- 
florescence alternate, all subsessile, oblong, elliptic, or obovate, obtuse, entire, indistinctly 
triple-ribbed, hirsute; heads in leafy racemes, solitary in the axils of the floral leaves, which are 
similar to and not much smaller than the foliage leaves; involucre hemispheric, about 5 mm. 
broad; bracts 4 or 5, more or less united into a cup, rounded at the apex; paleae subtending the 
pistillate flowers oblong-spatulate, the inner ones oblanceolate or narrow with spatulate tips; 
staminate flowers about 20; corolla funnelform; anthers with acute tips; style short; stigma 
capitate, penicillate; pistillate flowers 5-8; achenes obovate, somewhat rounded, trigonous, 
glandular-muriculate. about 3 mm. long. 
I. foliolosa Nutt. is a stout form of the Northwest with large heads and less deeply lobed 
involucre; J. axillaris pubescens A. Gray, is one from San Francisco south, with long loose 
pubescence. 
TYPE LOCALITY: “‘Upper Louisiana”’ [North or South Dakota]. 
a DISTRIBUTION: Saline soil, from Saskatchewan to British Columbia, California, and New 
exico. 
ILLUSTRATIONS: Hook. Fl. Bor. Am. I. 106; Britt. & Brown, Ill. Fl. eee Gok Aaa CHIAe 
Clark & Fletcher, Farm Weeds Can. pl. 22; pl. 55. f. 54; ed. 2. pl. 55; pl. 735, f. 77; Clark & Fletcher, 
Mauv. Herbes Can. $l. 22; pl. 55; f. ape Bull. Agr. Coll. Colo. 23: $1.5, 0; Bull. Nev. Exp. Sta. 22: 
pl. 3; Bull. Wyo. Exp. Sta. 31: pl. 1 
11. Iva imbricata Walt. Fl. Car. 232. 1788. 
Iva integrifolia Banks; Pursh, Fl. Am. Sept. 580, as synonym. 1814. 
A perennial, with suffruticose base; stem terete, glabrous, decumbent at the base, 3-10 
dm. high, branched; leaves mainly alternate, sessile, fleshy, oblong, acute, 1-5 cm. long, in- 
distinctly triple-ribbed; heads in leafy spikes; floral leaves similar to the lower leaves but some- 
what smaller; involucre hemispheric, 5-8 mm. broad; bracts 6-9, more or less imbricate, broadly 
obovate or orbicular, glabrous, glandular-punctate, with membranous, yellowish, erose mar- 
gins; paleae of the receptacle spatulate or oblanceolate; staminate flowers many; corolla elongate- 
funneliform; anthers with acute tips; rudimentary style half as long as the stamens: pistillate 
flowers 2—4; achenes elliptic-obovate, only slightly compressed, glandular-muriculate, 5 mm. 
long, olive-brown. 
TYPE LOCALITY: Carolina. 
nN DISTRIBUTION: Sand-dunes and beaches, from Virginia to Florida and Louisiana; Bahamas; 
uba. 
ILLUSTRATION: Britt. & Brown, I'l. Fl. f. 3588; ed. 2. f. 4122 
DOUBTFUL SPECIES 
Iva ANNUA L. Sp. Pl. 988. 1753. This was described from South America but has also 
been credited to Central America. In our herbaria there is no specirnen from either Central 
or South America like this plant, if Schmidel’s figure [Ic. p/. 16] represents it correctly. This 
may represent an abnormal J. ciliata, perhaps changed through cultivation. In such a case 
I. annua J,. should be substituted for J. ciliata Michx. 
