300 LAMIACEAE. 



20. MENTHA L. MINT. 



Whorls of flowers forming terminal spikes. i. M. spicata. 



Whorls of flowers axillary. 



Leaf-blades thin, dark green, not strongly veined, tapering gradually into slen- 

 der petioles, which equal or exceed the flower-clusters. 2. M. borealis. 

 Leaf-blades thick, strongly veined, abruptly contracted into short petioles, 

 which are much shorter than the flower-clusters. 3. M. Penardi. 



1. Mentha spicata L. (M. viridis L.) Moist fields and waste places, from 

 Me. and Minn, to Fla. and Colo. Introduced from Europe. North Denver 

 (Eastwood). 



2. Mentha borealis Michx. (M. canadensis glabrata Benth ; not M. glab- 

 rata Vahl.) In wet places from N. B. and Mont, to Va. and Utah. Alt. 

 6500-7500 ft. Cimarron and Squaw Hill. 



3. Mentha Penardi (Briq.) Rydb. (M. arvensis Penardi Briq.) In wet 

 places, especially among bushes, from Neb., Mackenzie River and B. C. to 

 Colo, and Utah. Alt. 4000-8000 ft. Canon City ; along Uncompahgre River, 

 near Ouray; Durango; Montrose; Gunnison; Pagosa Springs; Cucharas 

 Valley, near La Veta ; Ft. Collins; Kremmling; Parlin, Gunnison Co.; 

 Alamosa ; Walsenburg ; Boulder. 



Family 119. SOLANACEAE Pers. NIGHT-SHADE FAMILY. 



Fruit a berry. 



Corolla plicate ; lobes usually induplicate ; all our species herbs. 

 Calyx inflated and bladder-like in fruit. 



Corolla open-campanulate, yellow or whitish, often with a dark center ; 



seeds finely pitted; flowers nodding in anthesis. i. PHYSALIS. 



Corolla rotate, violet or purple ; seeds rugose-tuberculate ; flowers erect in 



anthesis. 2. QUINCULA. 



Calyx not inflated and bladder-like in fruit. 

 Calyx closely investing the berry. 



Stamens alike, not declined ; low unarmed perennials. 



3. CHAMAESARACHA. 



Stamens dissimilar, declined ; prickly annuals. 4. ANDROCERA. 



Calyx not inclosing the berry. 5. SOLANUM. 



Corolla little if at all plicate ; its lobes valvate ; shrubs. 6. LYCIUM. 

 Fruit a capsule. 



Capsule circumscissile near the top, which separates as a lid ; corolla irregular. 



7. HYOSCYAMUS. 

 Capsule opening by valves ; corolla regular. 



Capsule prickly ; seeds flat. 8. DATURA. 



Capsule not prickly; seeds scarcely flattened. 9. NICOTIANA. 



i. PHYSALIS L. GROUND-CHERRY, STRAWBERRY TOMATO. 



Annuals with branching roots ; fruiting calyx cordate-ovoid, acuminate, strongly 



5-angled. 



Leaf-blades very oblique, cordate, sinuate-dentate. i. P. pruinosa. 



Leaf-blades orbicular or broadly ovate, sinuately crenate, scarcely cordate and 

 scarcely oblique at the base. 2. P. -iieo-mexicana. 



Perennials with horizontal rootstock or rarely with woody caudices. 



Pubescence if any not stellate, although in P. pumila with some branched hairs. 

 Leaves and stem glabrous or the veins of the former and the upper part of 



the latter with scattered appressed hairs. 



Leaf-blades ovate, ovate-lanceolate or oval. 3. P. subglabrata. 



Leaf-blades lanceolate, oblanceolate or linear. 4. P. longifolia. 



Leaves and stem more or less pubescent with spreading hairs. 



