MACLOSKIE I UMBELLIFER^E. 625 



Leaves entire or toothed, or ternately or palmately dissected. Stipules 

 none, or like cilia, or scarious. Umbels sessile amid the leaves or peduncled, 

 simple, or irregularly compound, many- or few- or only i -flowered. In- 

 volucral bracts small and free, or large and connate, or radiant. Petals 

 somewhat concave, entire, imbricate. Calyx-teeth evident. Fruit later- 

 ally compressed or not ; furrowed, or constricted at the commissure. Car- 

 Pels subterete, or pentagonal, rarely dorsally flattened. Primary ridges 

 subequal ; the lateral distinct from the commissure. Vittce between the 

 ridges more or less conspicuous. Seed straight, subterete. 



Species 35, in Andesia and Antarctic Amer., Austral., Tasmania and 

 N. Zeal.; reaching Mexico. 



GENERIC SUBSECTIONS. 



1. Fragosa. Stems pulvinate or covered by imbricating leaves, or divided into long branches 



covered by leaf-sheaths. Leaves naked at the base or ciliate. Small plants ; disk large, 

 lobed ; oil-sacs of fruit large, often brown ; as aretioides, ccespitosa, selago. 



2. Pozoa. (Separate genus in Eng. & Prantl, not found in Patagon.) Leaves subradical, with 



long dilated petioles. Umbels many -flowered, simple hydrocotylifolia, 



3. Microsdadium. (Austral.) Cespitose. Umbels few-flowered. Bracts few, small. 



4. Schizeilema. Cespitose, stoloniferous ; like Hydrocotyle ; leaves in rosettes or scattered, not 



imbricated ; umbels stalked ; involucral bracts numerous ranunculus. 



5. Huanaca. Low, with radical rosettes of long-petioled leaves, whole or lobed or partite. 



Flowers on long pedicels, in many-rayed umbels with an involucre of leaves ; as acaulis. 



6. Pectophytum, Cespitose closely leaved, with old stems surrounded by sheaths of old leaves. 



Terminal umbels amid the upper leaves ; each pedicel swollen below the ovary and articu- 

 lated ; as glebaria, lycopodioides, nivalis, trifurcata. 



KEY TO THE SPECIES. 



A. Long-petioled leaves from the ground. 



b. Scape-like stem trifid at top, 2-leaved, all the leaves and the involucre with filiform seg- 

 ments. Umble with long rays. acaulis. 

 b2. Leaves reniform-peltate. Scapes 1-7, long; umbels capituliform ; involucre of I broad 

 leaf, toothed. hydrocotylifolia. 

 3. Stem creeping and rooting. Leaves rounded and divided. Peduncles short ; umbel 3-5- 



flowered ; involucral bracts linear. ranunculus. 



A2. Stem short. Leaves palmately 3-5-parted. Umbel 2O-flowered ; involucral bracts lanceolate. 



morenonis. 

 A$. Caespitose, with entire leaves ; many form cushions. 



b. Leaves scale-like, with slender petioles from an enlarged base. Umbels of 1-6 small 



flowers. White-silvery. ameghinoi. 



b2. Leaves fleshy, ovate, concave. Umbels sessile, few-flowered. bovei. 



3. Leaves linear, the wide sheaths filamentous. Umbels sessile, 6-8-flowered. 



ccespitosa. 



