MACLOSKIE : CALYCERACE^E. 757 



A2. Flowers of center sterile ; marginal flowers fertile, their fruits connate and crowned by the 

 thorny calyx. 4- Acicarpha, p. 764. 



i. BOOPIS Juss. 



Glabrous; stem ascending and branching, or scapiform and i -headed. 

 The heads pedunculate; all the flowers in a head are of the same charac- 

 ter, or with a few smaller sterile flowers. Invohtcrate bracts partly con- 

 nate. Achenes free, crowned by the calyx-teeth. 



Species 10, in Chilian Andes. (Fig. in Eng. & Prantl, iv, 5, p. 86, A-D.) 



KEY TO THE SPECIES. 



A. Leaves fleshy. 



b. Leaves linear, subentire or subpinnate. chubutensis. 



b2. Leaves lanceolate or narrower, sessile, mostly amplexicaul, toothed. Calyx-lobes and 



achene dimorphous ; the achene winged. crassifolia. 



b$. Leaves oblanceolate or obovate, long-attenuate-petiolate. Involucre i -leaved, 5-8- 



toothed. patagonica. 



64. Cauline leaves linear, subentire or basally appendaged ; lower leaves rosulate. Stems 



concrescent, diverging above, I -headed. australis. 



5. Leaves ovate to subspatulate, entire, the lower with whitish petioles. alpina. 



b6. Leaves rounded, toothed, with long, broad petioles. Flowers long, green, without 



involucre. ameghinoi, 



Az. Leaves not fleshy. 



b. Leaves entire or nearly so, linear. 



c. Short, leafy branches, with heads sessile amid the leaves. filifolia. 



c2. Scape remotely leafy, apically i -headed and with axillary heads. leptophylla. 



b2. Radical leaves linear-lanceolate, incised, often recurved, attenuate-petiolate. Peduncles 



i-headed, leafy near top. squarrosa. 



3. Radical leaves spatulate, half-pinnatifid, upper leaves simpler, leafless at top. Heads 



terminal, I (rarely 2). scapigera. 



64. Leaves pinnatisect. 



c. Segments capillaceous. Corolla-tubes slender. Achenes winged. anthemoides. 



c2. Segments narrow-linear. Head solitary, terminal, on a long peduncle, rigidula. 

 C3- Segments oblong, pinnately toothed. Cau line-leaves similar but simpler. Flowers 



white. multicaulis. 



5. Leaves pectinate, oblong-linear. Corolla short, its tube nearly cylindrical, gracilis. 

 b6. Leaves laciniate. . laciniata. 



i. B. ALPINA Poepp. (Gamocarpha poeppigii DC.) 



Leaves fleshy, green to glaucous, plicate, ovate or subspatulate, entire, 

 the lower with a whitish petiole. 



S. Patagon., by Rio Chico de la Sta. Cruz. 



