RypBErRG: Srupies oN THE Rocky Mountain Frora 689 
Key tothe Species 
Leaves from cordate to broadly ovate-lanceolate : all distinctly petioled. 
Leaves cordate. 
I, A. nyctaginea. 
Leaves ovate, rounded or cuneate at the base. 2. A. floribunda. 
Leaves ovate-lanceolate, oblong or linear, sessile or only the lower short-petioled. 
Involucres in open terminal cymes. 
Stem more or less hirsute as well as viscid. 
Leaves ovate or broadly oblong, as well as the stem conspicuously hir- 
sute, 3. A. hirsuta, 
Leaves linear-lanceolate, almost glabrous; stem sparingly hirsute or 
glabrous except under the nodes. 4. A. pilosa. 
i Stem glabrous below, not hirsute, viscid-puberulent above. 
Flowers solitary in the involucre on short slender pedicels ; fruit nearly 
glabrous. 5. A. glabra. 
Flowers 2-3 in the involucres, subsessile ; fruit decidedly pubescent. 
Leaves of the cymes much reduced and bract-like, upper portion of 
the stem densely and finely puberulent. —6.._- A. bracteata. 
Leaves of the cymes neither much reduced nor bract-like. 
Leaves erect or ascending ; lobes of the involucre rounded or 
broadly triangular-ovate. 
Plant prostrate or diffuse; involucres and branches of the 
inflorescence densely viscid hairy, 7. A. diffusa. 
Plants more simple, erect or ascending ; branches of the 
inflorescence usually merely viscid-puberulent. 
Leaves from ovate or obovate to linear-lanceolate, 
usually over 5 mm. wide. 8. A. lanceolata. 
Leaves narrowly linear, less than 5 mm. wide, 
g. A. linearis. 
Leaves divergent; lobes of the involucre elliptic or oval. 
oy 10. A. divaricata. 
Involucres on solitary axillary peduncles, rarely also in small dense terminal clusters. 
Leaves oblong, lanceolate or linear-lanceolate. 
Stem hirsute. 11. A. aggregata. 
Stem glabrous. 12. A. decumbens. 
Leaves narrowly linear. 13. A. Bodinit. 
I. ALLIONIA NycTAGINEA Michx. Fl. Bor. Am. 1: 100. 1803 
Oxybaphus nyctagineus Sweet, Hort. Brit. 1: 334. 1825. 
A well-known and common plant growing in rich soil from 
Illinois and Saskatchewan to Wyoming, New Mexico and 
Louisiana. * 
2. ALLIONIA FLORIBUNDA (Choisy) Kuntze, Rev. Gen. 533. 1891 
AA. ovata Pursh, Fl. Am. Sept. 1: 97. 1814. Not Oxybaphus 
ovatus Vahl. 1806. 
he Allionia Cervantesii has been reported from Colorado, but the specimens on which 
this assertion has been made belong in all cases I know to Adlioniella oxybaphoides. 
