Lithophragmas
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L. glabrum has more rounded hypanthium (the basal part of the floral bract), where L. parviflorum has a distinct longer conical hypanthium that sometimes flares again at the rounded part (and is larger flowered despite the name parvi meaning small).
Plus L. glabrum flowers earlier in early spring (adamschneider) and the petals in L. glabrum are more deeply divided (sometimes almost looking like several petals for each of the five petals).
Number of petal lobes, number of flowers, leaf shape, and depth of petal division (deeper being L. glabrum) are helpful when the hypanthium is more elongate.
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Thanks Jim. This is quite useful to me, it's reduced my error and (hopefully) made me observe more closely.
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