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ROBINSON AND GREENMAN.— GENUS CALBA. 29 
ends, callous-denticulate, short-petioled, paler beneath, 3-nerved, 1} to 2 
inches long, 9 or 10 lines broad: heads 2 to 4 at the ends of the branches 
(springing from the opposite axils of the last,pair or two pairs of leaves), 
half inch in diameter, homogamous: outer involucral scales scarcely 
shorter than the inner, broadly oblong, rounded at the apex: scales of 
the pappus linear-attenuate, about 20 in number: achenes glabrous. — 
Collected by Z. W. Nelson, near Choapam, altitude 3,800 to 4,500 feet, 
28, 29 July, 1894, no. 898. 
* + + Doubtful and poorly characterized species, probably referable to this 
subdivision and very likely synonymous with some of the foregoing species. 
22. C. cacosmioides, Less. “ Bracteoles [by which is meant ap- 
parently the chaff] broad, at the apex laciniate, acuminate and aristate: 
involucres cylindrical, about 12-flowered: differing from C. solidaginia, 
Kunth, not only in the form of the bracteoles, but also in the radiate 
heads, and in the leaves obtuse at the base or acute but not acuminate 
into petioles, sharply serrate, subglabrous, lucid above.” — Linnea, v. 
167. — Tn open places near Jalapa, October, Schiede & Deppe. The 
characters translated from the original Latin description. 
23. C. brachiata, DC. “Shrub: branches brachiate: leaves ovate, 
obtusely mucronate: heads fasciculate and mostly terminal.’’ — Prodr. 
Vv. 673 (whence deser.). Mocinna brachiata, Lag. Nov. Gen. 31. Galin- 
sogea brachiata, Spreng. Syst. iii. 579.— “In Panamaide” acc. to 
Lagasca, |. c.. 
Subgenus 4. TETRACHYRON, Benth. & Hook.f. Heads corymbose, 
tadiate: leaves oblong or lanceolate, often with interpetiolar dilation : 
both disk- and ray-flowers yellow: scales of the pappus only 4.— Gen. 
u. 391, Tetrachyron, Schlecht. Linnea, xix. 744. 
24. C. manicata, Benth. & Hook. f., 1. ¢c. A tall glabrous shrub, 
8 to 12 feet in height: leaves lanceolate, gradually narrowed at both 
ends, serrate, 4 or 5 inches long, 9 lines broad, nigrescent in drying: 
Involucres somewhat turbinate-campanulate, ecalyculate: corymbs flat, 2 
to 6 inches or more in diameter: rays about 12: scales of the pappus a 
third to half as long as the achene. — Benth. & Hook. f. acc. to Hemsl. 
Biol. Cent.-Am. Bot. ii. 206. Tetrachyron manicatum, Schlecht. 1. ¢. 
— Cordillera near Vera Cruz, Galeotti, no. 2309; Mirador, Liebmann, 
no. 392, Dr. Berendt, and E. W. Nelson, no. 85; Orizaba, Schaffner, 
Botteri, no. 807; also Sierra del Borrego, above Orizaba, altitude 4,500 
feet, Pringle, no. 6133 
25. C. Orizabaensis, Klatt. Branchlets pentagonal: lower leaves 
Petiolate, large, 5 inches long, 3 inches wide, oblong, sinuate-undulate, 
