40 ROBINSON 
1-2 cm. wide; corymbs branched, often subsimple, 4-10 cm. in 
diameter the lower branches conspicuously spreading and elongated, 
then curved upward toward the tip; heads about 18-flowered, 12 
mm. long, 5 mm. high; scales about 28, stramineous and pale exéept 
at the obtuse subherbaceous green or purplish tinged pubescent tip, 
pale-margined; corollas purple, smooth, slender, 5.5 mm. long; 
achenes 3.5 mm. long, scabrid on the angles; pappus-bristles, dull 
yellowish-white, obscurely barbellate—Symb. Fl. Argent. 169 (1879); 
Hieron. in Engl. Bot. Jahrb. xxii. 746 (1897). E. Arnotianum Griseb. 
Abh. Goett. xix. 167 (1874), as to plant but probably not exactly 
as to syn. E. affine Hook. & Arn. not HBK. 
Tara: Prov. Mendez: Camataqui, alt. 2500 m., Fiebrig, no. 3076 (Gr.). 
feet INDICATION OF LOCALITY: Bridges (K). 
8. E. squalidum DC. Prod. v. 142 (1836); Bak. in Mart. Fl. 
Bras. vi. pt. 2, 281, t. 77 (1876); Robinson, Proc. Am. Acad. liv. 
334 (1918). Widely distributed in South America and subject to 
considerable variation especially in the amount and nature of the 
pubescence. 
[Var. typicum Robinson, |. c. Stem and lower ‘surface of the 
leaves villous-hirsute, the hairs spreading; leaves roundish-ovate; 
heads about 30-flowered——Common on plains in the interior of 
Brazil. 
Var. tomentosum (Sch.-Bip.) Bak. More softly and densely 
pubescent, the hairs mostly incurved; branches fewer, more elon- 
gated and flexuous; leaves tending from rhombie-ovate to ovate-ob- 
long with a somewhat prolonged cuneate entire basal portion; heads 
rather densely aggregated at the tips of the branches in trichotomous 
panicles, 28-33-flowered, the young involucre ovoid, acutish; achenes 
3-3.4 mm. long.—Bak. in Mart. Fl. Bras. vi. pt. 2, 282 (1876), as 
tomentosa. Osmia tomentosa Sch.-Bip. ex Bak. |. c. in synon 
squalidum Britton, Bull. Torr. Bot. Club. xviii. 333 (1891), not pre- 
cisely of DC. 
ue Prov. Larecaja: Mapiri, alt. 1525 m., Rusby, no. 1622 (Gr., N. Y., 
In the interpretation of this variety I have regarded Pohl’s_no. 
291 (Berl., phot. Gr.) as the most authentic material, since it bears 
in Schultz’ s own hand the label “Osmia tomentosa Sch. Bip. nov. 
spec.” So far as can be judged from a fairly clear photograph of 
this type it is precisely matched by Dr. Rusby’s specimen from Bo- 
livia. However, some Brazilian material associated with var. tomen- 
