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WOOTON AND STANDLEY FLORA OF NEW MEXICO. 219 



2. ALLIONIA L. 



Perennial herbs, glabrous or pubescent; leaves opposite, often thick and fle.-^hy, 

 green or glaucous, petiolate or sessile; involucre gamophyllous, 5-lobed, enlarged in 

 fruit; flowers 1 to 5 in each involucre; perianth white to crimson, short-funnelform 

 or campanulate, oblique; stamens 2 to 5; fruit clavate, 5-angled or 5-ribbed. 



KEY TO THE SPECIES. 



Fruit deeply 5-lobed; flowers deep red, often cleistogamous; peri- 

 anth deeply lobed or somewhat bilabiate. 

 Plants tall, sparingly branched; involucres 3-fruited; flowers 



seldom cleistogamous; leaves linear 1. A. cocdnea. 



Plants low, diffusely branched; involucres 1-fruited; flowers 



usually cleistogamous; leaves filiform 2. A. linearifolia 



filifolia. 

 Fruit 5-angled, not lobed; flowers whitish to purplish red, never 

 deep red; perianth shallowly lobed, never bilabiate. 

 Leaves narrowly oblong to ovate. 



Stems hirsute throughout 3. A. hirsuta. 



Stems not hirsute. 



All leaves sessile or nearly so 4. A. lanceolata. 



All leaves except the uppermost petiolate. 



Ijeaves and stems pubescent throughout 5. A. comata. 



Leaves glabrous; stems pubescent only above 6.^. melanotri- 



cha. 

 Leaves linear or nearly so. 



Plants glabrous throughout or with a few appressed hairs 

 on the involucres and pedicels; fruit glabrous. 



Peduncles and involucres glabrous 7. A. glabra. 



Peduncles and involucres sparingly hairy 7a. A. glabra rece- 



dens. 

 Plants copiously pubescent, at least on the branches of the 

 inflorescence; fruit pubescent. 

 Inflorescence axillary or of few-flowered clusters at the 

 ends of the branches. 

 Lobes of the involucre obtuse; plants slender, 



erect, little branched 8. A. pinetorum. 



Lobes of the involucre acute; plants stout, spread- 

 ing, much branched 9. A. bodini. 



Inflorescence paniculate or corymbose, well developed. 



Stems liirsute throughout 10. A. subhispida. 



Stems glabrous below. 



Stems very stout, simple or sparingly 

 branched, erect; leaves very glaucous 



and fleshy, sessile 11. A. linearis. 



Stems much branched, slender, not stiffly 

 erect; leaves not glaucoiis or but slight- 

 ly so. 

 Leaves sessile, thick, pale green; sterna 

 low, spreading or ascending, dif- 

 fusely branched; branches of the 

 inflorescence densely viscid-hairy; 



perianth pinkish 12. A. diffusa. 



Leaves distinctly petioled, bright green, 

 thin; branches of inflorescence 

 merely viscid-puberulent; peri- 

 anth bright purplish red 13. A. divaricata. 



