530 PROCEEDINGS OF THE AMERICAN ACADEMY. 
ZALUZANIA, Pers. Heads (medium-sized) heterogamous with obvi- 
ous rays or in one species homogamous and discoid. Involucre hemispher- 
ical; bracts 1-3-seriate, linear to ovate, appressed, subequal. Receptacle 
conical; pales conduplicate: ray-flowers uniseriate, few to many, stylif- 
erous and fertile, rarely wanting: disk-flowers regular, perfect, fertile; 
the tube usually slender and pubescent, tending to expansion over the 
summit of the achene; the subcylindric throat of about equal length ; 
limb of 5 ovate or triangular acute teeth. Anthers unappendaged at the 
base. Style-branches obtuse or with a short acute appendage. Achenes 
of the disk-flowers somewhat flattened; pappus none; achenes of the 
ray-flowers 3-gonal, sometimes crowned with a few deciduous scales. — 
Syn. ii. 473 (1807); DC. Prodr. v. 553; Benth. & Hook. f. Gen. ii. 
362; Hoffm. in Engl. & Prantl, Nat. Pflanzenf. iv. Ab. 5, 233. Chil 
ophyllum, DC. 1. c. 554. Hybridella, Cass. Dict. xxii. 86. Ferdinanda, 
Lag. Elench. 31. Chrysophania, Kunth in Less. Syn. Comp. 224.— 
Twelve species extending from Arizona to South Mexico and (?)Central 
America. 
Subg. 1. Hysrmerra. Palustrine perennial herbs: leaves 3-4 
pinnatifid: disk globose, large, 1.2 to 1.6 em. in diameter; pales very 
narrow: rays oblong-linear, yellow, numerous (20 to 30), irregularly 
bifid at the apex. — Hybridella, Cass. Bull. Soc. Philom. 1817, p. 12, & 
Dict. xxii. 86. Chiliophyllum, DC. Prodr. v. 554. 
- 1. Z. aLososa, Sch. Bip. Decumbent, hirsute: stems 3 dm. high, 
bearing 8 to 5 leaves and about 6 long-peduncled heads: radical leaves 
several, 1 to 1.5 dm. long, 4-pinnatifid, the ultimate lobes lance-linear, 
acute, 2.5 to 3.5 mm. long: cauline leaves similar, oblong in general con- 
tour, the margined petioles copiously ciliate or even lanate near the base: 
involucral scales lanceolate, acute. — Flora, 1861, p. 564; Hemsl. Biol. 
Cent.-Am. Bot. ii. 159, excl. pl. Hartw. and syn. in part. Anthems 
globosa, Ort. Dec. 46; Jacq. Hort. Schoenb. iii. t. 8372 (cited in text 9 
371). Ohiliophyllum globosum, DC. Prodr. y. 554. — Swamps, low 
meadows, &c., San Luis Potosi, Parry & Palmer, no. 527; Valley of 
Mexico, Bourgeau, no. 385, Schaffner, no. 80, Pringle, nos. 2925, go0s; 
Mexico, without locality, Bates, Schmitz, no. 46. 
2. Z. myrropnyiia, Sch. Bip. 1. c. 565. Identical in habit, pubes 
‘cence, and floral characters with the preceding: leaves also oblong ™ 
contour, the cauline about 4; ultimate segments very small (2 mm. long 
or less, and 0.8 to 1 mm. wide), rounded at the apex. — Z a, 
Hemsl. 1. c. in part. — Aguas Calientes, Hartweg, no. 111. Type num 
FT ee, en ee, ee ee aa ee 
