AMMIACEAE. 253 



shortly acuminate, simply or doubly serrate with short acute teeth; 

 uppermost leaves ovate-lanceolate; umbels in loose, terminal and 

 axillary, compound or simple racemose panicles which are 3-6 dm. 

 long, more or less glandular-tomentose; rays numerous, 8-12 mm. 

 long; involucres of several linear bractlets; flowers 3-4 mm. long; 

 disk and stylopodium obsolete; styles united to the middle; fruit 

 about 4 mm. long, reddish, becoming nearly black. 

 Frequent along streams above 2000 feet. May-July. 



Family 75. AMMIACEAE. Carrot Family. 



Herbs with alternate decompound, compound or vsome- 

 times simple leaves, the petioles often dilated at the 

 base, the stems usually hollow. Stipules none or rarely 

 present and minute. Flowers small in compound or 

 simple umbels or rarely in heads, often polygamous. 

 Umbels and umbellets commonly involucrate or involu- 

 cellate. Calyx-tube wholly adnate to the ovary, its mar- 

 gin truncate or 5-toothed. Petals 5, inserted on the mar- 

 gin of the calyx, usually with an inflexed tip. Stamens 5, 

 inserted on the epigynous disk; filaments filiform; 

 anthers versatile. Ovary inferior, 2-celled; styles 2, 

 filiform, distinct, often borne on a conic or depressed 

 stylopodium; ovules 1 in each cell, pendulous, anatrop- 

 ous. Fruit dry, composed of 2 carpels, separating at 

 maturity along the plane of their contiguous faces {com- 

 missure)] either flattened laterally (at right angles to 

 the commissure), or dorsally (parallel with the commis- 

 sure), or nearly terete. Carpels after parting supported 

 on a slender axis {carpophore), more or less ribbed or 

 winged. Pericarp membranous or corky-thickened, usu- 

 ally containing oil-tubes between the ribs and on the 

 commissural side. Seeds usually adnate to the pericarp, 

 their inner faces flat or concave; endosperm cartilaginous; 

 embryo small. ( Umbelliferae.) 



Flowers in dense, usually rather spiny heads. 4. Eryngium. 

 Flowers umbellate. 



Fruit covered with hooked bristles. 3. Sanicula. 



Fruit with bristles only on the ribs. 



