x 
EUPHORBLE OF LOWER CALIFORNIA, 439 
Il. EUPHORBLE OF A COLLECTION BY L. J. XANTUS IN LOWER CALIFORNIA. 
FroM THE PROCEEDINGS OF THE AMERICAN ACADEMY OF ARTS AND Scrences, Vou. V. 1861; IN AN ARTICLE BY Asa GRAY.* 
107. EurpHoRBIA LEUCOPHYLLA, Benth. Bot. Voy. Sulph. p.50. These specimens, from the original  [168, 169] 
locality of the species, perfectly agree with Bentham’s Soiciosioe: but wonld be called rather grayish-hoary 
than snow white; the leaves are very deeply and almost pectinately dentate, supported by extremely short petioles ; 
the appendages of the dark red or almost black glands are very unequal, as they commonly are in A nisophyllum, and 
in no species more so than in £, adenoptera, Bertol. (Z. dioica, HBK.), the posterior ones being always the largest ; 
in the specimens before me the posterior appendages are one line broad and half as long, the anterior ones 
scarcely more than half a line broad and somewhat shorter ; they are always crenate or even deeply incised, [170] 
the posterior more so than the anterior ones. Ovary and capsule together with the styles hairy, but the st ipe gla- 
rous : styles longer than ovary, distinct, about two thirds divided : stigmas scarcely clavellate. Seed oval, sharp- 
angled, slightly undulate, nearly 0.5 line long. 
108. EupHorpia sETILoBa, Engelm. in Bot. Williamson, Pacific R. R. Rep. 5, p. 364, Identical with the 
plant from the Lower Colorado, described in the report above cited. Root thick, but evidently annual ; many stems 
from a few inches to a span long, almost verticillate from the very base, an arrangement which is very striking in the 
Californian #. polycarpa and the European E. Chamesyce, but not so distinct in most other Anisophylla. Lower leaves 
coarsely serrate ; upper ones entire; in the Colorado plant all nearly entire. Involucra minute, scarcely a third of a 
es long ; ie came perpendicular, not horizontal, dark red, with conspicuous white laciniate miata Male 
wers, 5-8 ; in the original specimens scarcely ever more than 3. Ovary and capsule covered with short pubescence 
ete hispid) ; pao nearly } line long, very slender, their anshes remarkably club-shaped ; seeds scarcely 0.4 lines 
long, sharp-angled, acute, transversely rugose. — Distinguished from the closely allied EH. polycarpa by the slit in the 
posterior part of the involucrum, the shape of the eptaniagte, and the more acute and much more rugose seeds, — E. 
setiloba has also been collected by Dr. Newberry in the sandy deserts west of the lower Colorado river. 
109. EupHorBia potycaRrPA, Benth. Bot. Voy. Sulph. p. 50. No doubt identical with the original form, col- 
lected in the same neighborhood, but with rather larger leaves than Bentham describes. The  . referred here 
by me in Bot. Mex. Bound. p. 186, undoubtedly belong here, as also E. ocellata, Nutt. in Hb. Hook., from San Diego, 
Coulter’s No. 1448 in Herb. A. Gray, and specimens collected by Dr. Newberry near Los Angeles er in the 
Mohave desert. M. Boissier, however, distinguished, and perhaps ated, Wright’s No. 1854, from the San [171] 
Pedro River in Arizona, under the name of E. micromera, in DC. .» by the very small involucres (0.2 
line Jong), the entire sbectics of appendages on the small yellow, not tent: glands, and the extremely short styles 
with subglobose stigmas. The length of the styles in these Huphorbie, however, is not a very safe character, as this 
specimen from San Tia , and some others from Arizona and the Colorado desert prove: they have suberect styles 
shorter hes the ovary fale about 3 line long), while most b forms from the State of Califoriits have elongated styles 
with divaricate clavate branches, twice as long as the ov My remarks about the variability of the plant may be 
extended to the shape of the leaves, which are usually sed: — or oblong-linear, and obtuse at the base, but in 
specimens collected by Dr. Newberry at Laguna I find them almost orbi cular and deeply cordate at the hase. e 
stipules are divided on the upper, and united on the lower side ie the stem, lanceolate-subulate, mostly entire and 
ciliate, in the specimen from San Lucas, however, glabrous. Stem and leaves usually glabrous, sometimes with a few 
scattered hairs, or entirely pubescent. The pubescent forms have always very narrow appendages, and the pubescence 
extends even to the ovary and capsule. The seeds are 0.4 line long, sharp-angled, with the sides almost smooth, or 
usually more or less distinctly undulate. 
110. EUPHORBIA HYPERICIFOLIA, Linn. var. COMMUNIS, Map in Bot. Mex. Bound. p. 188. E. Preslit, — 
sone, Fl. Sicul. 1, p. 531; Boiss. in DC. Prod. ined. — ages weighty authority has not convinced me that 
Linnean E. hypericifolia, with smaller flower heads, smaller capsules, and smaller and paler seeds, is distinct ose our 
common Boa ea var. communis. This latter has become ata in Italy, where it has been described under dif- 
ferent names (E. androsemifolia, Presl, E. trinervis, Bertol., and E. Presiii, Guss.) ; nor can I distinguish Z. lasiocarpa, 
Klotzsch, from the West Indies and South Astaaien, by any ae besides the pubescent capsules. Intermediate 
forms unite all these forms. 
. EvpHORBIA GYMNOCLADA n. sp.: fruticosa? ramis basi lignescentibus teretibus gracilibus strictis gla- 
| ie rameis ternatis internodio elongato multoties brevioribus linearibus seu oblanceolato-linearibus integris 
earnioeulis (siccitate conduplicatis) subtus puberulis supra subnudis in petiolum brevissimum attenuatis; cymz ter- 
* The specimens were all collected in the vicinity of Cape San Lucas. — Eps, 
