PHYTOLOGY AND THERAPEUTICS. 107 
7 a.m. Geranium carolinianum, wild geranium; close at noon. 
Sa. 
in. 
Lactuca ludoviciana, wild lettuce; close at noon. 
Lactuca floridana, blue-flowered wild lettuce; close after noon. 
Ruellia ciliosa, ruellia; flowers drop off about 3 p. m. 
Dianthera americana, water justicia; drop off middle of afternoon. 
Hieracium longipilum, hairy hawkweed; close middle of afternoon. 
Portulaca retusa, notched purslane; close after noon. 
Callirrhoe alczoides, pink rose-mallow; close in evening to reopen 
next day. 
Lactuca sagittifolia, arrow-leaved lettuce; flowers close at noon. 
Troximon cuspidatum, wild dandelion; close at dusk: reopen next 
day. 
Taraxacum dens-leonis, dandelion; close at dark to reopen next day, 
except in rainy weather, when it may be closed in daytime and 
open at night. Do not close for a shower in sunshiny weather. 
Oxalis stricta, sorrel; close at noon for good. 
Oxalis violacea, pink sorrel: close at noon to reopen (?). 
Houstonia angustifolia, bluets; close at noon; reopen for two or three 
days in succession. 
Linum rigidum, yellow flax; fall off at 1 p. m. 
Linum suleatum, large-flowered yellow flax; fall off at 2 p. m. 
9 a.m. Houstonia minima, little bluets; close at 2 p. m.; reopen next day 
10 a. 
il a. 
12 a. 
1 p. 
2 p. 
3 p. 
4p. 
m. 
m. 
m. 
ni. 
m. 
m. 
m. 
once. . 
Specularia leptocarpa, Venus mirror; close permanently at 2p. m. 
Specularia perfoliata, Venus mirror; close at 2 p. m. and disappear. 
Portulaca oleracea, purslane; wilt after noon. 
Portulaca pilosa, wild portulaca; close at 1 p. m.; do not reopen; 
while the flowers of P. grandiflora, a cultivated plant said to be 
a variety of this and whose flowers open and close at about the 
same time, do reopen. 
Echinocystis lobata, wild cucumber; close at 3 p. m. 
Linum usitatissimum, flax; drop off about 5 p. m. 
Abutilon avicennz, velvet-leaf; close before noon. 
Sida spinosa, prickly sida; close at 2 p.m. 
Opuntia polyacantha, many-spined prickly pear; close at 4 p. m. to 
reopen for several days. This has sensitive stamens. 
Talinum calycinum, large-flowered talinum; close early in afternoon. 
Cucurbita foetidissima, wild gourd; close at 3 p. m. 
Opuntia fragilis, little prickly pear; close at 4 p. m., to reopen for 
several days. 
Opuntia humifusa, western prickly pear; close at 5 p. m. to reopen. 
Hibiscus trionum, flower-of-an-hour; close at 2 p. m. 
Hibiscus militaris, evening hibiscus; remain open until dark. 
Talinum teretifolium, terete-leaved talinum; close 2 to 3 p. m. 
Silene antirrhina, catchfly; close at 3 or 4 p. m. 
Mamillaria missouriensis, straw-colored pincushion-cactus; close at 
5 p. m. to reopen next day. 
Mamillaria vivipara, red pincushion-cactus; close at 5 p. m. to reopen 
next day. 
Mentzelia nuda, great mentzelia; close at daylight to reopen. 
Silene stellata, starry campion; close toward midnight. 
Allionia nyctaginea, wild four-o’clock; close next day. 
Allionia linearis, narrow-leafed wild four-o’clock ; close next morning. 
Allionia albida, white wild four-o’clock; close next morning. 
