386 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
This very distinct species closely simulates the monotypic genus Lecocarpus, also 
endemic in the GalApagos Islands (on Chatham and Charles islands), but is at once 
distinguishable by the lack of the broad spreading circular -border which terminates 
the fruiting phyllaries in that genus. A. lecocar poides has been recorded by Stewart 3 
from Sappho Cove on Chatham Island. 
2. Acanthospermum humile (Swartz) DC. Prodr. 5: 522. 1836. PLATE 23, b. 
Melampodium humile Swartz, Prodr. Veg. Ind. Occ. 114. 1788. 
Centrospermum humile Less. Syn. Gen. Compos. 217. 1832. 
Acanthospermum humile a normale Kuntze, Rev. Gen. Pl. 1: 303. 1891. 
Much branched, erect or decumbent, 30 cm. long or more; stem fuscous, densely 
puberulous and hispid-pilose with many-celled spreading hairs; leaf blades 1 to 2.8 
cm. long, 1 to 3.3 cm. wide, ovate or deltoid-ovate, obtuse or acutish, abruptly nar- 
rowed into a margined petioliform base, irregularly crenate-dentate or repand-serrate, 
gland-dotted and hispid-pilose particularly along the veins on both sides, slightly 
paler beneath, the irregularly serrulate, lobulate, or entire, petioliform, margined 
base 4 to 18 mm. long; heads solitary in the axils and forks of the stem, sessile or on 
peduncles 3 mm. long or less, 3.5 to 4 mm. wide in anthesis, 12 to 15 mm. in fruit: 
outer phyllaries 5, oval, acutish, 3-nerved, hispid-pilose chiefly on margin, 2.5 mm. 
long, 1 mm. wide; ray flowers 5 to 7, their corollas erect, pale yellowish, oval, emar- 
ginate, hispid-pilose, 1.3 mm. long, about equaled by the style, with very short 
tube; disk corollas 5, stipitate-glandular and sparsely hispid-pilose, 1.4 mm. long; 
pales emarginate, lacerate at apex, 1.3 mm. long; fruit cuneate, compressed-trigonous, 
gland-dotted and more or less pilosulous, uncinate-prickly on the angles and the 
apical margin, the sides unarmed or with a few sparse prickles, the body 3 mm. 
long, the two large terminal prickles (one usually straight, one uncinate) 2 to 3 mm. 
long. 
Tyre Locauity: “Jamaica, Domingo.” 
SPECIMENS EXAMINED: 
Fiorwa: Ballast wharf, Pensacola, August, Curtiss 1491* (N). 
Cuspa: Weed, Laguna Jovero and vicinity, 1911, Shafer 10968 (N), 10985 (N). 
Open places in thicket, valley of Rio Bacuranao, Havana, 1912, Wilson & Leén 
11605 (N). Vicinity of Vento, Havana, 1904, Wilson 1328 (N). Roadside 
near La Gloria, Camaguey, 1909, Shafer 321 (N). Maisi to Sabana, Oriente, 
1910, Shafer 7936 (N). Without definite locality, Wright 311 (N). Nueva 
Gerona, Isle of Pines, 1904, Curtiss 361 (N). 
Jamaica: Green Valley, altitude 610 meters, 1895, Harris 5733 (B). Sand near 
beach, Long Acre Point, west of Black River, 1907, Harris 9964 (B, N). 
Without definite locality, Dr. Wm. Wright (B). 
Santo Dominao: Paradis, Province of Barahona, 1909, Tiirckheim 2709 (N); 
in 1911, Fuertes 1100 (N). Without definite locality, Swartz (B). 
Panama: Boca Chica de Horconcitos, Chiriquf, 1911, Pattier 5123 (N). Chagres, 
1850, Fendler 171 (N). Along beach between Faté and Playa de Damas, 
Province of Coldén, 1911, Pittier 3833 (N). Waste places about Panama, July, 
1862, Hayes (B). Without definite locality, Hayes 198 (B); Seemann 296 (B). 
CuLtivaTEepD: Kew Gardens, 1784 (B). 
Swartz,‘ in his amplified description of this species, remarks: “Planta agricolis 
odiosa; et semina pullis Gallinarum et Meleagridum obnoxia.”’ 
3. Acanthospermum hispidum DC. Prodr. 5: 522. 1836. PLATE 23, c. 
Acanthospermum humile 8 hispidum Kuntze, Rev. Gen. Pl. 1: 303, 1891. 
Erect, 20 to 55 cm. high, dichotomous; stem stout, striatulate, hispid-pilose with 
spreading many-celled hairs, sordid-puberulous between them; leaf blades 2 to 
12.5 cm. long, 0.8 to 8 cm. wide (including the cuneate base), elliptic to ovate or 
3 Proc. Calif. Acad. IV. 1: 148. 1911. 4 Fl. Ind. Oce. 3: 1371. 1806. 
