934 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
RanGE: Washington and Oregon to California and northern New Mexico. 
New Mexico: Vicinity of Tierra Amarilla (Hggleston 6478, 6543). Open slopes, 
in the Transition Zone. 
49. ALSINACEAE. Chickweed Family. 
Low slender annuals or perennials, with opposite simple leaves and small white 
flowers; inflorescence cymose or the flowers solitary and axillary; sepals 4 or mostly 5, 
distinct, or slightly united at the base; petals not clawed, entire, emarginate, or 
deeply cleft and parted, often wanting; fruit a capsule, dehiscing by longitudinal 
valves. 
KEY TO THE GENERA. 
Stipules present though sometimes fugacious. 
Styles simple below.....................-2--0.22---- 1. Drymarta (p. 234), 
Styles branched to the base..................--.----- 2. Tissa (p. 235). 
Stipules wanting. 
Petals 2-cleft or 2-parted. 
Capsules short-ovate or oblong; styles usually 3... 3. ALSINE (p. 235). 
Capsules long-cylindric, often curved; styles usu- 
ally 5.2... eee eee eee ence 4, CeRAstium (p. 236). 
Petals entire or emarginate. 
Styles as many as the sepals and alternate with 
them.........0.. 22. eee eee eee ee eee eee 5. Sarna (p. 238). 
Styles fewer than the sepals, or when of the same 
number opposite them. 
Seeds with a basal membrane (strophiole) at 
the hilum. ...............--22.-2002- 6. MoEHRINGIA (p. 238). 
Seeds not strophiolate. 
Capsules with twice as many valves as 
styles. 2... ee cece ce ence eens 7. ARENARIA (p. 238). 
Capsules with the same number of valves 
as styles.--............2...2..2-. 8. Atsrnopsis (p. 240). 
1. DRYMARIA Willd. 
Low slender erect or prostrate annuals or perennials with inconspicuous flowers; 
leaves with stipules, these sometimes fugacious; sepals and petals 5, divided; stamens 
usually 5; capsule 3-valved. 
KEY TO THE SPECIES. 
Cauline leaves broadly ovate. 
Plants erect, glandular, bright green; leaves abruptly acu- 
minate........... wee e eee eee e nace cence eeccccceces .. L. D. fendleri. 
Plants prostrate, glabrous and glaucous; leaves obtuse....... 2. D. pachyphylila. 
Cauline leaves linear. 
Cauline leaves pseudoverticillate 
Cauline leaves opposite. 
Plants tall, 10 to 15 cm., erect; sepals acute; pedicels usu- 
wee eee cence eee cn ec enees . 3. D. sperguloides. 
ally several times as long as the calyx............ 4. D. tenella. 
Plants low, 4 cm. or less, depressed; sepals obtuse; pedi- 
cels as long as the calyx or shorter................. 5. D. depressa. 
1. Drymaria fendleri 8. Wats. Proc. Amer. Acad. 17: 328. 1882. 
Type Locauity: New Mexico. Type collected by Fendler (no. 60). 
Rana@e: New Mexico and Arizona, southward into Mexico. 
