Part 2, 1915J CARDU ACE AE : TAGETEAE 159 



bipinnatifid with narrow, linear-filiform divisions, glabrous or minutely scabrous; heads 

 numerous; peduncles 1-2 cm. long; involucre fusiform, 7 mm. long, 2.5 mm. broad, with 

 rather strong ribs, but not decidedly 5-angled at the base; bracts 5; tips cuspidate from a 

 broad base; glands many, small, subrotund in 2 lateral rows; ray-flowers 1-3, or sometimes 

 wanting; ligules oval, 1.5 mm. long, yellow; disk-corollas 3 mm. long, glabrous; achenes 4.5 

 mm. long, strongly striate; 2 of the squamellae bristle-like, 3 mm. long, hispidulous, the other 

 3 oblong, 1 mm. long. (Tagetes congesta is a depauperate form with shorter peduncles.) 



Type locality: Mexico. 



Distribution: Lower California to San Luis Potosi and Costa Rica. 



33. Tagetes micrantha Cav. Ic. 4: 31. 1797. 



A slender annual; stem 1-3 dm. high, terete, with numerous strongly ascending branches; 

 leaves filiform or with a few similar divisions, opposite or the upper alternate; peduncles 

 slender, about 2 cm. long; involucre cylindro-fusiform, about 7 mm. long, 2 mm. broad; bracts 

 3-5, with rounded mucronate tips, and with two marginal rows of minute rounded glands; 

 ray-flowers 0-3, usually 1; ligules oval or obovate, 2 mm. long; disk-flowers 5-7; corollas gla- 

 brous, 3 mm. long; tube slightly shorter than the trumpet-shaped throat; achenes 6 mm. long, 

 striate; 2 or 3 of the squamellae bristle-like, hispidulous, 4-5 mm. long, the rest obovate to 

 oblong, 1-1.5 mm. long. 



Type locality: Near City of Queretaro. 

 Distribution: New Mexico and Arizona to Queretaro. 

 Illustration: Cav. Ic pi. 352. 



Excluded or unknown species 



Tagetes rotundifolia Mill. Gard. Diet. ed. 8. Tagetes no. 8. 176S. This was described 

 from specimens introduced by Houston from Vera Cruz, having slender-petioled simple leaves 

 with rounded-cordate, remotely crenate, pointed blades. This description fits no species 

 of Tagetes known, nor any plant of the tribe, unless Porophyllum macrocephalum DC. 



Tagetes Ozalis Spreng. ; Steud. Nom. Bot. Phan. 824, nomen nudum. 1821. 



Tagetes lanceolata Llave, Reg. Trim. 1: 357. 1832. Probably not a Tagetes, but be- 

 longing to some related genus. 



Tagetes maculaTa Steud. Nom. Bot. ed. 2. 2: 660, nomen nudum. 1S41. 



Tagetes Michauxiana Roem.; Steud. Nom. Bot. ed. 2. 660, nomen nudum. 1S41. 



3. SYNCEPHALANTHA* Bartl. Ind. Sem. Hort. Goett. 1836: 6. 

 1836.— Linnaea 12: 80. 1838. 



Annual herbs. Leaves alternate and opposite, pinnately dissected with broad toothed 

 divisions. Heads conglomerate into heads of a secondary order, the central ones discoid, the 

 marginal ones with 1-3 rays on the peripheral side. Involucre campanulate; bracts 5 or 6, 

 cuneate-oblanceolate, rounded and erose at the apex, with a single large gland; the outer 

 heads with 1-3 linear accessory bracts. Receptacle small, convex, shortly nmbrillate. Ray- 

 flowers pistillate, fertile; ligules oblong, entire. Disk-flowers many, hermaphrodite and fertile; 

 corolla-tube glandular-puberulent, about equaling the cylindro-campanulate throat; lobes 

 5, short. Anthers entire at the base. Style-branches slender, with dilated, truncate, penicillate 

 apex. Achenes clavate, angled, striate, hirsute. Pappus of 15-20 squamellae, each dissected 

 into many bristles. 



Type species, Syncephalantha decipiens Bartl. 



Principal bracts oblong, strongly keeled, hispidulous; accessory bracts hispidulous; 



leaf-segments oblanceolate. many-toothed. 1-3 cm. long. 1. -S. decipiens. 



Principal bracts obovate, glabrous; accessory bracts crisp-hairy; leaf -segments 



cuneate to broadly oblanceolate, few-toothed, rarely 1.5 cm. long. - 5. sanguined. 



* Syncephalanthus of Bentham, Klatt, and others, is here regarded as a mere variant spelling. 



