474 
BOTANY. 
14. L. rARViFLORTJM, Gray. Loaves lincar-spatulate, 2-r>'' Ion o- ; pedicels loiij? ; flowers tetra- 
merous ; calyx equally 4-toothefl or 2-3-cloft ; corolla 2 ' lonji-, "2 times exoecdiiitj; the calyx, the throat 
dilated, aiid lolies half-shorter than the tulie. — Arizona. 
NYCTAGINACE^. 
The follow iug conspectus of the N. American genera of the order is (with some additions) essentially 
as given hy Dr. Gray in the Botaiuj of the Mexican Boundari/, pp. 172-175. The synopsis of the genus 
Abvonia is the result of an examination of the collections of Drs. Gray and Torrey aud Prof. Eaton. 
I. MIRABILE^E, Gray. Involucre calyx-shaped, of united bracts, 1-12-llowered. Stigma capitate, 
granulate. 
* Fruit symmetrical, wingless ; involucre 5-cleft. 
1. MIRABILIS, L. Fruit smooth, not angled, scarcely or not at all ribhed, ovoid ; involucre herb- 
aceous, unchanged in fruit ; stamens most usually 5. 
2. OXYBAFHUS, L'Her. Fruit with 5 stout ribs, obovate or clavate ; involucre enlarged in fruit, 
broad-rotate, scarions, reticulated; stamens most usually 3. 
* * Fruit smooth, sometimes furrowed, with winged rigid mostly dentate inflesed margins, with a 
double line of stipitate tubercles between ; involucre 3-parted, 3-flowered, not scarious-dilated in 
fruit. 
3. ALLIONIA, L. The only species, A. i>'carxata, L., is found in W. Texas and westward along the 
Mexican boundary to S. California; also in Peru. Involucral leaves ovate, concave, scarcely united 
at base ; calyx campanulate-funnelform, mostly 4-lobed, the lobes notched ; stamens usually 3, included ; 
fruit oval. 
II. ABRONIE^, Gray. Involucre perfect, of 5-15 distinct bracts, subtending a many-iiowered 
head. Stigma capitate or liuear-clavate. 
4. NYCTAGINIA, Chois. Calyx tubular-fnnnelform with entire lobes ; stamens and stj-le long-ex- 
serted ; fruit nut-like, as in MirahiUs, without ribs.— The only species, IST. capitata, Chois., occurs in AV. 
Texas aud N. E. ilexico. Pubescent; leaves triangular-acuminate, undulate, attenuate iuto the petiole; 
involucre of 8-12 linear-lanceolate very acute leaflets, 4-6" long; calyx villous, red, V long, the limb 
5-plicate. ^ 
5. ABRONIA, J uss. Calyx salverform with obcordate lobes ; stamens aud style included ; the perfect 
fruit 5-winged ; embryo by abortion monocotyledonous. 
III. ACLEISANTIIE J?:, Gray. Involucre imperfect, of 2-3 small bractlets to each flower, or none ; 
stigma smooth, peltate or cap-shaped. 
6. SELINOCAEPUS, Gray. Fruit with ,5, or by abortion 3, veiuless wings.— Tlu-eo species, occur- 
ring in S, New Mi'xico and tlie valley of the Rio Grande, viz :— 
S. J)irji .SI S, Gray. Scabrous and subviscid ; stems much-branched, depressed or spreading-diffuse ? 
leaves ovate or ovate-oblong ; flowers usually in pairs, subsessile ; calyx-tube 1}' long ; stamens 5. 
S. CI^ENoroI)IOIDEs, Gray. Grayish pulverulent, erect ; leaves broadly ovate or subcordate ; flowers 
cymulose-fascicled, pedicclled, small ; calyx short cup-shaped, the tube nearly none ; stamens 2. 
S. ANGUSTiFDijus, Gray. Sul>viscid-puberulent ; stems slender, G-10' high ; leaves narrow-elliptic ; 
flowers solitary, at l.n-th pendent; calyx funuelform, tube 1-2" long; stamens 5. 
. Z' f^^^^^^^-'^^'^^^^^' '^^™y- r^it and calyx (long-tubular) as iu Mmd)iH^.— Tom species, occurrin-v 
in \\ . Icxas and adjoining Mexico, viz : — 
A. cras-Sifolia, Gray. Scabrous-pub orulent, decumbent: leaves thick, ovate, rounded at base • 
calyx-tui.e l|-2' Jong, the limb 6" ; fruit ..void, scarc.-ly costate. 
A. LON.aror.iA. Gray. Glabrous, divaricately branched; leaves deltoid-ovate or rhomboid-lance- 
olate; calyx-tube .')-G' long ; fruit cylindrical, 5-angled. 
, , ^ BEULAxntKur, Gray. Glabrous, diifuse ; L.u-. s cordate, r.-niform or ovate; calvx 1-2' long, the 
tube 2-3 tiuu's longer than the linil). ' ^ 
A. AXisoffivij. V. (nay. Xraiiy glabrous, prostrate ; leaves oval or ovate, oblique at base, very une- 
qually pau-ed : caly.v-t ub,- 11-^- long, many times the limb ; fruit 10-costate, 2" long. 
i.. r * -^y- I'^-'it cylindrical, 5-ribbed, the ribs glandular and usually thickened 
S en'd^r t^i I" f ^'^^^ Texas aud adjoining Mexico, 
felender tube of tlie calyx U' l<mg ; .staiuens exserted ; fruit 3-4" lou^^. ^ 
