AMMIACEAE. 



VOL. II. 



2. Spermolepis patens (Nutt.) Robinson. Spread- 

 ing Spermolepis. Fig. 3162. 



Lcptocaulis patens Nutt. ; DC. Prodr. 4 : 107. 1830. 

 Apiastrum patens Coult. & Rose, Rev. no. 1888 

 Spermoltf. is patens Robinson, Rhodora 10 : 34. 1908. 



Erect, slender, i-2 high, divergently branched above. 

 Stem-leaves short-petioled, biternately dissected into nar- 

 rowly linear or filiform segments; umbels terminal, or 

 axillary, i'-lj' broad; rays 3"-6" long; pedicels \\"-z" 

 long in fruit ; fruit ovate, slightly more than i" long, more 

 or less tuberculate, usually densely so. 



Sandy soil, Indiana to Missouri, Nebraska, Texas and New 

 Mexico. June. 



3. Spermolepis echinatus (Nutt.) 

 Heller. Bristly-fruited Sper- 

 molepis. Fig. 3163. 



Leptocaulis echinatus Nutt. ; DC. Prodr. 4 : 



107. 1830. 

 S. echinatus Heller, Con-tr. Herb. F. & M. Coll. 



i: 73- 1895. 



Resembling the preceding species, but 

 lower, seldom over i high, the branches 

 ascending or sometimes spreading. Rays 

 of the umbel very slender, ii' long, or less; 

 fruit about \" long, covered with spreading 

 hooked bristles, the ribs obsolete, the com- 

 missure narrow. 



Alabama to Missouri, Texas and California. 

 April-May. 



40. AMMOSELINUM T. & G. Pac. R. R. Rep. 2 : 165. 1855. 



Low branching annuals, with ternately divided finely dissected leaves, the ultimate leaf- 

 segments linear, spatulate, or oblong, and small white flowers in terminal sessile or pedun- 

 cled slender-rayed umbels. Involucels of a few linear or dissected bracts. Calyx-teeth 

 obsolete. Fruit ovate to oval, laterally flattened, strongly ribbed, the ribs tuberculate or 

 spinulose-tuberculate ; pericarp very thick and dense; oil-tubes solitary in the intervals, and 

 2 on the commissural side. Styles and conic stylopodium short. [Greek, sand-parsley.] 



Two known species, of the southwestern United 

 States and Mexico, the following typical. 



i. Ammoselinum Popei T. & G. Pope's 

 Sand-parsley. Fig. 3164. 



A. Popei T. & G. Pac. R. R. Rep. 2: 165. 1855. 

 Apium Popei A. Gray, Proc. Am. Acad. 7 : 343. 1868. 



A diffusely branched herb, 6'-i$' high, the 

 angled branches, rays of the umbels, and pedi- 

 cels, rough. Lower leaves slender-petioled, the 

 upper sessile, or nearly so, all dissected into 

 linear obtuse or acutish segments about \" 

 wide; involucre usually of i dissected leaf or 

 more ; involucel-bracts few, entire, or dissected ; 

 longer rays of the umbels i' long in fruit, or 

 less, the shorter ones often i-flowered ; fruit 

 ovate, 2"-2j" long, narrowed above, i" wide, or 

 a little more, the ribs rather strongly tubercled, 

 or even spinulose. 



In sandy soil, Kansas to Texas. April-May. 



