PRIMULACEAE (PRIMROSE FAMILY) 177 



ANDROSACE 



Flowers white or pink. Calyx persistent, 5-lobed or -parted. Stamens 

 included. (Gk. andros = a man, sakos = a buckler or shield ; probably 

 referring to the form of the leaves.) 



A. Leaves lanceolate or oblong-lanceolate, often toothed, 12-25 mm. long; calyx tube 

 white to reddish; calyx segments subulate; capsule shorter than the calyx. E. 



A. septentrionalis 



AA. Leaves ovate, entire, 3-5 mm. long; calyx tube green; calyx segments triangular; 

 capsule much longer than the calyx. W. E. A. filiformis 



STEIRONEMA 



Perennial; stems leafy. Flowers axillary. Corolla rotate, deeply 

 5-parted ; sinuses rounded ; segments ovate, cuspidate-pointed, each rolled 

 about its stamen. Stamens alternating with 5 sterile filaments. Capsule 

 io-2o-seeded. (Gk. steiros = sterile, nema = a thread ; referring to 

 abortive stamens.) 



A. Leaves ovate-lanceolate to oblong-ovate, minutely ciliate; corolla lobes nearly 

 twice as long as the calyx. C. E. S. ciliatum 



AA. Leaves lanceolate to linear-lanceolate, not ciliate; corolla lobes but little longer 

 than the calyx. U. S. laevigatum 



TRIENTALIS (STAR FLOWER) 



Perennial, glabrous; stem 2.5-15 cm. high, from a tuber. Leaves simple, 

 alternate but mostly clustered at the top. Flowers white or pink ; pedicels 

 filiform. Corolla completely rotate; segments 5-7, almost separate. 

 (L. trientalis = pertaining to a third ; because they are about ^ foot high.) 



A. Leaves crowded near the stem tip; woods plant; pedicels shorter than the leaves. 



W. C. E. T. latifolia 



AA. Leaves scattered along the stem; bog plant; pedicels longer than the leaves. 



W. C. E. T. arctica 



DODECATHEON (SHOOTING STAR) 



Perennial, low. Leaves entire to dentate. Flowers in an umbel on a 

 naked scape. Calyx deeply 4~5-lobed; lobes reflexed in flower, erect in 

 fruit. Corolla segments long, narrow, reflexed. Seeds many. (Gk. 

 dodeka = 12, theos = god; the name of the Primrose, which the 12 superior 

 gods were thought to protect.) 



A. Flower parts normally in 4*5. C. E. D. tetrandrum 



AA. Flower parts normally in s's. 

 B. Herbage glabrous. 

 C. Leaves entire. 



D. Filaments free or anthers sessile. 



E. Leaves broadly elliptic to obovate. W. D. latifolium (MOSQUITO-BILLS) 



EE. Leaves narrower. 

 F. Leaves 2-5 cm. long; scape 0.7-1.5 dm. long. E. D. campestre 



F. & R. EL. FL. 12 



