BLAKE—REVISION OF ACANTHOSPERMUM. 889 
middle into a margined petioliform base, sessile, obscurely repand, triplinerved above 
the base, green on both sides and rather sparsely pilose, the hairs longer and spreading 
along the veins, elsewhere more or less appressed; heads solitary in the axils and 
forks of the stem, sessile, 10 to 11 mm. thick in fruit; outer phyllaries 5, oblong or 
oblong-oval, rounded at apex, herbaceous, pilose-ciliate and on back sparsely pilose, 
4.5 to 5 mm. long, 1.5 to 2 mm. wide; ray corollas about 10, yellow, oval, emarginate, 
1 mm. long; disk corollas about 13, yellowish, sparsely pilose and glandular; fruit 
cuneate, compressed, flattened and 1-ridged on inner angle, 5.5 mm. long, 1 mm. 
wide at base, 4.8 mm. wide across the tips of the spines, the body (exclusive of the 
terminal spines) 5 mm. long, dull or greenish white, gland-dotted, with a short 
lanceolate compressed spine on the inner angle at apex and a longer lanceolate- 
subulate one on the outer, bearing about 2 stout aculei on the dorsal angle, on 
margin of inner angle, and at apex, the sides bearing 2 to 4 weak prickles. 
Type in the British Museum, collected on savannas near the River Daule, near 
Guayaquil, Ecuador, by R. Spruce (no. 6307). Fragments of type in the Gray 
Herbarium. 
Closely related to the last preceding species, which probably comes from essentially 
the same region, but distinguished by its larger fruit. The type collection was 
distributed as Acanthospermum xanthioides DC. (A. australe), an unrelated species. 
Two of the fruits are sometimes connate into one. 
6. Acanthospermum microcarpum Robinson, Proc. Amer. Acad. 38: 208. pl. 1, 
f. 3. 1902. PLATE 23, f. 
Erect, branching, 30 cm. high; stem stoutish, rather densely hirsute-pilose with 
several-celled wide-spreading hairs, in age glabrate; leaf blades 2.6 to 4.3 cm. long, 
1 to 1.8 em. wide, rhombic or rhombic-ovate, obtuse, abruptly or gradually contracted 
below the middle into a cuneate sessile base, crenate-serrate above the base, 3-nerved, 
rather sparsely hirsute-pilose on both sides with several-celled ascending hairs, gland- 
dotted beneath; heads sessile or subsessile in the forks of the stem and in the axils, 
9 mm. wide in fruit; phyllaries 4 to 6, elliptic or oblong-elliptic, obtuse or acutish, 
hispid-pilose-ciliate and sparsely hispid-pilose on back, 3.5 to 4.5 mm. long; ray 
corollas 8, yellowish white, quadrate-oval, tridentate, glandular on back, 1 mm. long; 
disk corollas 8, 1.2 to 1.5 mm. long, the slender tube and short-campanulate throat 
0.5 to 0.7 mm. long, sparsely hispid-pilose with several-celled hairs and gland-dotted, 
the 5 teeth ovate, acutish, spreading, sparsely hispid and gland-dotted; anthers 
cordate-sagittate at base; united style branches of ¥ flowers clavate, obtuse, hispid- 
ulous above; pales obovate, concave, lacerate at the obtuse apex; fruit trigonous- 
cuneate, compressed, 4.8 to 5.5 mm. high, 4 to 4.3 mm. wide across the tips of the 
spines, the body (exclusive of the terminal spines) 4 to 4.5 mm. long, with 2 lance- 
subulate, slightly compressed, straight or slightly curved spines at apex, gland-dotted, 
about 3-nerved on the sides, bearing mostly above middle on back and on sides toward 
apex a few subulate, straightish or slightly uncinate aculei. 
Tyre tocanity: Charles Island, Galapagos Islands. 
SPECIMEN EXAMINED: 
Gau4épagos Istanps: Charles Island, May, 1899, Snodgrass & Heller 446 (type; G). 
Acanthospermum microcarpum is intermediate between A. donti and A. simile, 
both of Ecuador, but is distinguished by the size of its fruit. 
7. Acanthospermum consobrinum Blake, sp. nov. PuaTeE 23, g. 
Branched procumbent ‘“‘annual,’’ 30 cm. long and more, the base not seen; stem 
subterete, striate, whitish, glandular-puberulous and pilose with loosely spreading 
shining many-celled hairs; leaf blades 1.7 to 2.5 cm. long, 6 to 12 mm. wide, obovate 
or rhombic-obovate, obtuse, cuneate into a sessile base, dentate above the middle 
(teeth 2 to 4 pairs, triangular, more or less depressed), triplinerved above the base, 
green on both sides and sparsely pilose with more or less appressed hairs, those along 
