COULTER AND ROSE—-NORTH AMERICAN UMBELLIFERAE. 87 
Specimens examined: 
Sourn Caroumna: Columbia, Katherine Taylor. 
Fioripa: East Florida, Palmer 196, in 1874; near Jacksonville, Curtiss, in 1875 
and 1894, 
Texas: Near Houston, //al/ 245, 246, April 18, 1872; near Dallas, Reverchon 369, 
May, 1877; near Eagle Pass, [avard, May, 1883; Travis County, Bodin, Sep- 
tember, 1891; Nueces County, //eller 1472, March 21, 1894. 
CauiForNiIA: Douglas, in 1833. 
In his publication of the combination Apium ammi, Urban referred the original 
Sison ammi to Jacquin, as though it might not be the same as Sison ammi of Linnaeus, 
This expression of doubt has led to the use of the second tenable specific name, 
Apium leptophyllum F. Muell. Upon examining the publication of Jacquin we dis- 
cover that he had no doubt that he was dealing with the Sison ammiof Linnaeus, and 
cites several of the Linnaean references, both from Europe and Africa. The plant 
was figured by Shaw as early as 1738, and both Linnaeus and Jacquin cite Shaw’s 
plate. There seems to be no reasonable doubt that Jacquin knew and used the Sison 
ammi of Linnaeus. 
For introduced species, see page 253. 
21. SPERMOLEPIS Raf. Neog. 2. 1825. 
Leptocailis Nutt. in DC, Coll. Mém, 5: 89. 1829, 
Calyx teeth obsolete. Fruit ovate, flattened laterally, bristly or 
tuberculate. Carpel with somewhat 
prominent or obsolete ribs, thickish 
pericarp, and prominent groups of 
strengthening cells. Stylopodium cont- 
eal, somewhat) prominent. Oil tubes 
solitary in the intervals, 2 on the com- 
missural side. Seed face plane. 
Very slender smooth branching annu- 
als, with finely dissected leaves having 
filiform or linear segments, and small flowers in involucellate very 
Fig, 20.—Spermolepis divaricatus: 
a, b, “12. 
unequally few-rayed pedunculate umbels. 
Type species, Daucus divaricatus Walt. FL Car, 114. 1788. 
A genus of 2 species, belonging to the southern United States, from 
North Carolina and Florida to southern California, and extending into 
Mexico. 
This genus is referred to Apiwn by Bentham & Hooker, who are followed by 
Drude in Engler & Prantl’s Nat. Pilanzenfumilien, but in our judgment it deserves to 
remain as a distinet genus. 
Fruit tuberculate........---.----------------------------------- 1. S. divaricatus. 
Fruit with hooked bristles ................-.--------------------- 2. S. echinatus, 
1. Spermolepis divaricatus (Walter) Britton, Mem. Torr. Bot. Club 
5: 244. 1804. Fia. 20, 
Daucus divaricatus Walt. Fl. Car. 114. 1788, 
Leptocaulis divaricatus DC. Coll. Mém, 5: 89, pl. 10, fig. a. 1829. 
.Leptocaulis diffusus Nutt. in DC. 1. e. 
Apium divaricatum Wood, Bot. & Flor. 140, 1870. 
