PRIMULACEAE (PRIMROSE FAMILY) 373 



persistent. Corolla hypogynous, except in Samolus in which it coheres below 

 with the base of the ovary, usually 5-parted, wanting in Glaux. Stamens as 

 many as the lobes of the corolla and opposite to them, inserted on the tube or 

 base of the corolla, rarely perigynous; anthers introrse. Ovary 1-celled, with 

 a free central placenta. Fruit capsular. 



Ovary wholly superior. 

 Corolla present. 



Scapose plants with basal leaves. 



Corolla-lobes erect or spreading; stamens included, distinct. 

 Corolla-tube equaling or exceeding the calyx. 



Corolla-lobes obcordate or emarginate; capsule many-seeded 1 Primula 

 Corolla-lobes entire; capsule few-seeded (1-2) . . .2. Douglasia 

 Corolla-tube shorter than the calyx. 



Perennials; umbel subcapitate; capsule few-seeded 3 Drosace 



Annuals; umbel open; capsules many-seeded . .' .* 4.' Androsace. 

 Corolla-lobes renexed; stamens exserted, connivent in a cone and 



somewhat monadelphous 5. Dodecatheon 



Leafy-stemmed plants. 



Flowers solitary in the axils 6. Steironema. 



Flowers in short axillary spikes 7. Naumbergia. 



Corolla wanting; calyx petaloid; leaves opposite . . 8 Glaux 



Ovary adnate to the calyx 9. Samolus. 



1. PRIMULA L. PRIMROSE 



Perennial scapose herbs with leaves all radical and flowers umbellate or in 

 involucrate or bracted racemose whorls at the summit of a scape. Calyx 

 tubular, funnelform, or campanulate, persistent, often angled, 5-lobed, the 

 lobes imbricated. Corolla funnelform or salverform, the tube longer than or 

 at least equaling the calyx. Stamens 5, distinct, inserted on the tube or at 

 the throat of the corolla. Style filiform; stigma capitate. Capsule 5-valved at 

 the summit, many-seeded. 



Leaves white-mealy beneath . . . . . . . . 1. P. americana. 



Leaves green. 



Plants small, 3-10 cm. high . . . . . . . . 2. P. angustifolia. 



Plants with large leaves; scapes 1.5-4 dm. high . . . . 3. P. Parryi. 



1. Primula americana Rydb. Bull. Torr. Bot. Club 28: 500. 1901. Per- 

 ennial: leaves oblong or oblong-oblanceolate or spatulate, 2-8 cm. long, ob- 

 tuse, gradually contracted at the base, sinuate-dentate or subentire, thin, 

 more or less mealy: scape 1-2 dm. high, mealy when young; bracts 6-10 mm. 

 long, linear-lanceolate; pedicels in flower little if any exceeding the bracts, 

 in fruit sometimes 2 cm. long: calyx 6-8 mm. long; lobes oblong-obtuse: 

 corolla lilac; tube 8-9 mm. long, only slightly exceeding the calyx; the lobes 

 obcordate, 2-3 mm. long. P. farinosa. Wet meadows; Colorado to Mon- 

 tana. 



2. Primuk angustifolia Torr. Ann. Lye. N. Y. 1: 34. 1824. Small: scape 

 1-flowered, 3-10 cm. high, equaling or surpassing the lanceolate-spatulate 

 obtuse entire short-petioled leaves: involucre of 1 or 2 minute bracts: lobes 

 of the lilac-purple corolla obovate, emarginate 6-8 mm. long? the tube hardly 

 exceeding the narrow teeth of the oblong calyx. Alpine in Colorado and Wyo- 

 ming. 



3. Primula Parryi Gray, Am. Journ. Sci. II. 34: 257. 1862. Large: leaves 

 rather succulent, spatula te-oblong or oblanceolate, 1-3 dm. long, often den- 

 ticulate: scape 1.5-4 dm. high, 3-12-flowered; bracts of the involucre sub- 

 ulate: calyx ovoid-campanulate, glandular, commonly reddish; the lanceolate- 

 subulate lobes as long as the tube: corolla crimson-purple with yellow eye; 

 the round, obovate lobes about 10 mm. long, emarginate or obcordate. A 

 handsome plant but very rank smelling; along subalpine brooks; Colorado to 

 Montana. 



2. DOUGLASIA Lindl. 



Depressed and tufted small herbs with suffrutescent or at least persistent 

 stems, imbricated or crowded leaves, and solitary or somewhat umbellate 



