[Vol. 8 
140 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Alyssum Schauerianum Kuntze, Rev. Gen. Pl. 2: 931. 1891. 
Synthlipsis lepidota Rose, Contr. U. S. Nat. Herb. 8: 294. 
1905. 
Perennial, silvery stellate throughout; stellae small, rays 
numerous, equal, united for half their lengths or more; caudex 
woody, sometimes elongating; stems many, branching, pro- 
cumbent to erect, 1.5-2.5 cm. long; terminal bud developing 
into a fertile stem; radical leaves narrowly oblanceolate to sub- 
lyrate with few teeth, acute, 3-6 cm. 
long; cauline leaves oblanceolate to 
nearly linear, entire, repand or with 
2-6 sharp teeth, often cuneate at 
base, 1.5-3.5 em. long; flowers incon- 
spicuous; petals pale yellow, in age 
becoming somewhat purplish, 7 mm. 
long; filaments linear; fruiting inflo- 
rescence elongated; pedicels .5-1.5 
mm. long, horizontal and sigmoid; 
pods strongly flattened at right angles 
to the septum, not keeled, erect, mid- 
vein lacking, elliptical or somewhat 
ovate, sessile, about 1 cm. long, on the 
Ieo L sewn ibi mature pod the stellae are not con- 
sketch x 1$. Trichomes x25. — tiguous;styles 1-2 mm. long; stigmas 
capitate; septum nerved from apex 
more than half way to base, thin, areolae straight or somewhat tor- 
tuous; ovules 8-10 in each cell, funiculi attached to septum one- 
half their lengths or less; seeds neither margined nor winged. 
Distribution: Central Mexico. 
Specimens examined: 
Mexico: 
Hidalgo: calcareous soil near Tula, July 13, 1898, Pringle 
6899 (Mo. Bot. Gard. Herb.); near Ixmiquilpan, 1905, Rose, 
Painter & Rose 8901 (U. S. Nat. Herb.); near Tula, July 3 and 
4, 1905, Rose, Painter & Rose 8850 (U. S. Nat. Herb.) ; Hacienda 
Palmar, near Pachuca, July 21, 1905, Rose, Painter & Rose 
8815 (U. S. Nat. Herb.). 
This species is very distinct from any other known member 
of the genus. On account of the strongly flattened pods it is 
