BLAKE—REVISION OF ACANTHOSPERMUM. 885 
KEY TO SPECIES. 
Leaves pinnatifid; fruit trigonous-turbinate, with 4 or 5 spines at summit, smooth on 
sides; ligules 7.5 mm: long. Section LecocarPorsis Blake. 
1. A. lecocarpoides. 
Leaves lyrately repand-dentate to subentire; fruit spiny at least on the angles, as well 
as at apex; ligules 1 to 1.5 mm. long. 
Fruit strongly compressed, cuneate in outline, obscurely ribbed, the two terminal 
prickles largest; heads usually sessile. Section CERATOCHLAENA DC. 
Terminal prickles slender-subulate, terete or very slightly flattened, about as long 
as the body of the fruit. 
Leaves with ovate or oval blade, abruptly contracted into a distinctly petiolar 
winged bas2.......-.-------eee eee rere r eter tert 2. A. humile. 
Leaves oval or obovate, gradually narrowed to the base.... 3. A. hispidum. 
Terminal prickles lanceolate or lanceolate-subulate, more or less flattened, much 
shorter than the body of the fruit. 
Body of fruit (excluding the terminal prickles) 3.5 to 3.8mm. long. 4. A.donil. 
Body of fruit 4 to 5 mm. long. 
Body of fruit 5 mm. long...-..-.---------+++++++-seertretee 5. A. simile. 
Body of fruit 4 to 4.5 mm. long........-----------+-++ 6. A. microcarpum. 
Fruit oblong-fusiform or oblong-obovate in outline, slightly compressed, strongly 
ribbed; heads (at least those in the forks) peduncled. Section XAaNTHTI- 
owes DC. 
Fruit sharply 2-beaked.........----------+e20ere eres 7. A. consobrinum. 
Fruit obtuse, with open orifice at apeX....-.-----+++-++--+++- 8. A. australe. 
1. Acanthospermum lecocarpoides Robins. & Greenm. Amer. Journ. Sci. IIT. 50: 
141. 1895. PLATE 23, a. 
Erect, sparsely branched, 28 cm. high; stem fuscous, densely stipitate-glandular 
and hispid with short several-celled spreading hairs, subglabrate below; leaf blades 
4.5 to 9 cm. long, 2.2 to 4.5 cm. wide, ovate in outline, divided to middle or deeper 
into 6 to 8 pairs of ovate to obovate lobes, these laciniate above the middle or pinnatifid 
nearly to base with somewhat revolute divisions, densely hispidulous-glandular 
above, beneath equally green, hispidulous along the nerves and glandular elsewhere, 
pinnate-veined, narrowed at base into the petiole; petioles margined above, glandular- 
hispidulous, 1.5 to 2.5 cm. long; heads solitary in the forks of the stem, 1.8 to 2.5 cm. 
wide; peduncles densely glandular-hispidulous, 2.3 to 4.5 cm, long; phyllaries 4, 
ovate, acute, hispidulous on both sides with glandular-tuberculate hairs and glandular, 
crenate-serrate, united at base, 9 to 10 mm. long; ray flowers about 6; rays ligulate, 
yellowish, oblong-elliptic, tridenticulate, about 9-nerved, stipitate-glandular dorsally, 
merely closed in a ring at base without proper tube, 7.5 mm. long, 2.2 mm. wide; 
disk corollas about 30, glandular, the tube cylindric, 1.5 mm. long, the throat campanu- 
late, scarcely broader, 0.7 mm. long, the 5 teeth erect, lanceolate, subacuminate, 1 mm. 
long; stamens strongly sagittate at base; pales slender, acuminate, densely stipitate- 
glandular, 4 mm. long; fruit trigonous-turbinate, somewhat gibbous above the middle, 
densely stipitate-glandular and _hispidulous with several-celled glandular-based 
hairs, the body 5 to 5.5 mm. high, 4.5 to 5 mm. wide, bearing around the rounded 
apex 4 or 5 slender-subulate, wide-spreading, straight or somewhat curved horns 
3 to 7 mm. long, the two on the inner angles always present, that on the outer angle 
sometimes obsolete. 
Type Locauity: Hood Island, Galapagos Islands. 
SPECIMENS EXAMINED: 
Gatdpacos Istanps: Hood Island, July, 1891, Baur 128 (type, G?); May, 1899, 
Snodgrass & Heller 744 (G). 
2 The following abbreviations are used to indicate the herbaria in which specimens 
are deposited: B, British Museum; Ber., Royal Herbarium, Berlin; G, Gray Her- 
barium; K, Kew Herbarium; N, U. 8. National Herbarium; Prod., Prodromus Her- 
barium. 
